<°)))o><

If you can't find a no-name one for a few cents or want to go for a brand I'd say Noctua NA-SYC. Considering everyone's asking 2-4€ for a single Y-cable 5€ for 3 seems fair enough.

Considering card 2 doesn't work on it's own in any PCIe slot it might be dead.

HE-400 with a soundcard isn't the best idea. They're low impedance and low efficiency, soundcards have high output impedance (10-100 Ohm) and might not be able to provide enough current even though gain isn't a problem. Also the treble on the HE-400 is really harsh.

About dacs and amps:
Basically every soundcard got high output impedance which is bad if you want to use low impedance headphones. Also it might not provide enough current for low efficiency headphones (e.g. Hifiman, see above). That means a lot of the time you'll need an amp. Now if you've got an amp and don't use the soundcard's fancy software features all the sc really does is act as an digital analog converter (DAC). A stand alone DAC is obviously cheaper since you're not paying for features/software you don't use. External DACs also benefit from not being crammed into a PC case full of electric fields.

Including the soundcard how much do you want to spend?

What soundcard will you get? An external dac/amp instead might make sense.
Soundcards are almost always a limiting factor because of their output impedance.

-open or closed? Open would be an option if you're using the M50s when "out and about"
-over ear or on ear?
-current soundcard/amp/dac?
-any preferences in terms of sound signature?

Here's my 2 Cents:
Forget the 4690K. No offense, but I don't think you know enough about overclocking. OC'ing on B85 is really dodgy so I wouldn't recommend it for a first timer. Adding a cooler and upgrading to a Z87/Z97 mobo isn't worth it in your case imho.
microATX is completely fine. Nowadays you should only go ATX if you need the features (you don't) or more PCIe slots (e.g. for multiple GPUs). None of this is the case so the PC would just take up more space if you went ATX.
Add a SSD if your budget allows it. You won't regret it.
You can pretty much ignore the brand of a PSU. Most don't manufacture the PSUs themselves (there are exceptions like Seasonic and SuperFlower) but instead they get them from multiple OEMs. For example Corsair uses at least 5 different OEMs: CWT, Great Wall, Chicony Power Technology, Seasonic and Flextronics. Even if you know the OEM that still doesn't tell you anything about the performance because each manufacturer got different platforms which perform differently. Unless you know which platforms are good and which aren't stick to reviews.

Some minor tweaks:
PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i5-4690 3.5GHz Quad-Core Processor ($209.99 @ Newegg)
Motherboard: MSI B85-G41 PC Mate ATX LGA1150 Motherboard ($78.29 @ Amazon)
Memory: Crucial Ballistix Sport 8GB (2 x 4GB) DDR3-1600 Memory ($73.95 @ Newegg)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($51.99 @ NCIX US)
Video Card: EVGA GeForce GTX 660 2GB Video Card ($159.99 @ NCIX US)
Case: Corsair 200R ATX Mid Tower Case ($59.99 @ Newegg)
Power Supply: Corsair CSM 450W 80+ Gold Certified Semi-Modular ATX Power Supply ($29.99 @ Newegg)
Total: $664.19
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-08-10 04:55 EDT-0400

Cheaper and faster GPU. R9 270 is still an option, don't know which games other than TF2 you are playing so I can't tell you if it's better or worse.
Cheaper and better PSU. 80+ Gold instead of Bronze, Semi-modular, supports Haswell low power states, better platform/performance overall. 450W is more than enough.
If you tell me your budget I'll add a SSD.

It has been confirmed for 3 years.
I guess we all know what that means.

#319
Other than that the BenQ Z series got a nice strobing utility and it's PWM-free. -> XL241Z > VG248QE, unless you want G-Sync

Why not the XL2411Z?

Assuming it's new/with the box it'll come with a DL DVI-D cable.

DVI pinout so you can check your GPU (since you didn't tell us which one you've got).

http://upload.wikimedia.org/wikipedia/commons/f/fb/DVI_Connector_Types.svg

No classlimits at all!
Watch the glorious pyro rush after 23:00.

#204
PSU model?
Depending on the game (scaling) 2 6850s should get you better performance. However Crossfire can introduce a couple of issues, most notably microstuttering. Also if you have a 1GB 6850 you shouldn't run Crossfire unless you're running all games at less than 1080p.
Check the motherboard, it might not support Crossfire anyway.

Forget about the 6970. Get a 260X instead. Same performance as the 6970 or 750Ti, same power consumption as the 6850.
http://ca.pcpartpicker.com/part/msi-video-card-r7260x2gd5oc
http://www.newegg.ca/Product/Product.aspx?Item=N82E16814127762

The 750 Ti uses the least power but it'll be more expensive than the 260X.

#205
I'm not sure how the 750 Ti isn't a straight upgrade, same performance as the 6970 at a quarter of the power consumption. http://anandtech.com/bench/product/1061?vs=1130
Also the 6970 would need two power connectors aswell. The 750 Ti needs none.

I still can't figure out what you mean. The question was about the new build.
I'm always going through a checklist.
Location & budget: US, 1k
Parts at hand: none
Performance: 120fps TF2 & CS:GO, Bioshock Infinite ? fps @ ?
Overclocking: ?

Correct me if anything is wrong and fill in the ?s.

#199
Glad I could help.

#200
Yes, if the next updates don't hit too hard 240fps should be possible.