All aboard AMD!

#19
Lightboost should be a lot more noticable than the better performance of the oc'd 7850. Why go 120Hz and then miss out on lightboost?

#14
It really depends on his budget now and in the future. Getting a 1TB HDD and a 600+ Watt PSU would probably save him some money.
I was assuming that he doesn't need the power of an overclocked 4670K right now because he wants to buy the cooler later. That means that he could buy a cheaper CPU now and then buy a overclockable broadwell CPU later so he could keep the mobo even longer.

EDIT: #16
I'd say go for the 660

#17
Pretty much this. To get more out of Haswell than Ivy Bridge if you overclock you pretty much have to do at least two of these three things:
- get a really good cooler
- be really lucky with the CPU in terms of overclockability
- delid it

Plus the LGA1150 will be kept for Broadwell so a non-K Haswell and an upgrade to broadwell later might be better.

I still don't know when OP wants to buy a cooler but with the stock cooler the 4670K might have some problems using turbo boost due to the temperatures.

Sorry, i must have skipped that line.
Nonetheless i still can't understand why you want the i5-4670K.
The 7850 will reach it's limit way before the i5-4670K.

When do you plan on buying the cooler?
And when do think you'll max out the 7850? Like zilis said you'd need another PSU aswell is you upgrade the GPU.

Peripheral shenanigans aside you're essentially squezing a 4670K (emphasis on K) into 700£ PC. There is absolutely no point in doing that, this CPU is basically oversized for that budget. Without an aftermarket cooler you won't even see any benefits from the 4670K compared to the non-K because the best you could hope for is not getting thermal throttled as soon as turbo boost kicks in, not even wasting a thought about overclocking.

Even TF2's love for high per-core-performance doesn't justify your choice.

Drop the 4670K and go for a FX-6350 with a decent cooler and you still got enough money left to upgrade to a 7870, 1TB and a small SSD.

If you want the Intel/Haswell swag really bad and you are willing to sacrifice overclocking then go for a cheaper i5, something like the 4430 or the 4570.

Head over to http://www.logicalincrements.com/ for some basic suggestion or to
http://www.reddit.com/r/buildapcforme if you want some more in-depth complete build suggestions or to
http://www.reddit.com/r/buildapc for more specific tweaking on your current build idea.

If your cooler can handle it (or if you delid) then overclocking haswell can give you anything from 4.2 to 4.8 GHz depending on the CPU. The range is a lot wider than with Ivy Bridge but Haswell @4.2GHz will perform at least as good as Ivy Bridge@4.5GHz, which is usually the maximum overclock you can get with air cooling on Ivy Bridge.

tl;dr
Worst Case: low oc, same performance as Ivy Bridge
Best Case/no oc: Haswell >>> Ivy Bridge
->Go for Haswell (the 4000 ones)

Ruwin confirmed for spiderman.

http://pcpartpicker.com/p/1a6SO
With the PSU that is on sale.
Drops the price to 750.50$.

The FX-8320 has a lower stock speed and overclocks slightly worse than the 8350.
Slightly worse performance, a bit cheaper:
http://pcpartpicker.com/p/1a73P

Swapping the GPU aswell, same story, a bit worse, a bit cheaper:
http://pcpartpicker.com/p/1a76y

http://pcpartpicker.com/p/19MQE
8350 instead of 8150

Performance of FX-8350 vs i5-3570K/4570K depends a lot on the implementation (256-bit or 128-bit instructions, int or float). I'm lacking the knowledge of both implementation of the H.264 codec in general and specifically in applications like OBS to properly predict how they should perform. And then there's always the randomness of TF2's source engine multithreading.

In theory, all implementation details aside, the considerably worse IPC (instructions per cycle) and TF2's inability to use more than 2 or 3 cores should give you less fps but also the opportunity to set process affinity and get rid of most of the lag that is usually affiliated with streaming because the remaining 5/6 cores are more than enough for continous encoding and therefore streaming.
Because the per-core-performance of the i5 is almost twice as high as the one of the fx-8000s (and a bit less than the per-module-performance, amd module = 2 cores) but the number of cores is only 4 compared to 8 you probably won't be able to set affinity (2 cores won't be enough for either of the two applications, TF2 and OBS). The higher per-core-performance will make higher fps in TF2 possible but the additional power used for TF2 might be missing for the encoding, resulting in a lagging stream.

tl;dr
fx-8x50: less fps possible in TF2, but affinity might reduce lag, cheaper
i5-x570K: more fps, might be unable to handle high fps in TF2 and streaming at the same time, higher cost
OP is on budget -> amd fx-8350

Afaik there won't be a team wales or scotland this time, only team UK. Probably because we threatened to found the glorious team BAVARIA if they are allowed to.

Hildreth IS the future.

DM != aim

Assuming that you don't have problems with overshooting or turning around (->wrong sens) aim is just a matter of practice.

MGE = aim + dodging vs 1 enemy
DM = aim + dodging vs multiple enemies
pugs = gamesense + aim + dodging in a real 6v6 game

Unless your gamesense, decision making and all that stuff is already perfect you should play pugs anyway.

For raw aim if that is your problem i'd say
solly: MGE > DM > pugs

scout vs scout: MGE > DM > pugs
scout vs everything: DM > MGE > pugs

demo: pug ~ pub (pugs require more thinking so you can't focus on your aim that much bt you'll see better movement/dodging)
most DM servers and the player on there are not demo friendly
demo in MGE pls no

medic: battle medic (doublemixes ~ pubs)

Decent quality is not enough when you have a relatively small die instead of the whole IHS to transfer the heat. On the die the difference between a decent TIM and liquid metal etc. is 20°C.
Afaik the gap height has been the same for ages it just wasn't an issue until now because the intel solder has a ridiculously high thermal conductivity.

It's free, although the windows version isn't up to date (yet).
http://support.apple.com/kb/dl1531

Firefox all the way.

Try deliding. The Ivy Bridge/Haswell TIM is pretty bad.
Delliding = Grab a hammer and a vice, remove the IHS (that metal thing above the processor itself) and replace the shitty intel thermal paste.
Sounds a lot more dangerous than it really is.

Without the thermal issues 4.5-4.8 should be possible, depending on your processor.