2639 frames 18.599 seconds 141.89 fps ( 7.05 ms/f) 7.216 fps variability

CPU and overclock: i5-3570K @ stock
Graphics Card: Intel HD 4000 (Integrated into the CPU)

Driver version: 9.17.10.2923
dxlevel (default is 90): 80
Resolution: 1280x720
Full-screen or windowed: Full
FPS configs enabled: Chris' highframes
Shadows enabled/disabled: disabled

Additional notes: 8 GB RAM.

EDIT:

2639 frames 17.147 seconds 153.91 fps ( 6.50 ms/f) 6.429 fps variability

with cl_threaded_bone_setup "1"

No.

Use the lowest resolution you possibly can.
Get the NoHats modification, it usually improves performance.
Overclock your CPU if your CPU and other components support it.

I could stream at 1024x768 with i5-3570k @ stock speed and HD 4000 (integrated into the CPU), 30 FPS, Maxframes/Highframes, the FPS was stable 151, but I had noticeable input lag and that was pretty much the only problem. No matter what settings in-game I've used nothing fixed it.

Maybe you can use your old case and HDD? It'll save you some money which you can spend on other parts.
And I'd change the GTX 650 to HD 7770 as it's a bit faster with the same price.
The 650W PSU is more than enough, I'd definitely go for something lower.

If you want to stream you should definitely overclock your CPU.

You can go 8 GB of RAM instead, it'll be more than enough and I'd rather get the 7970 as it's faster (and cheaper) than the GTX 680, plus you get free games with it if it matters to you. I'd also change the PSU to something different.

What's the point of getting i7-3770K if he's not going to overclock?
What's the point of getting H100 if he's not going to overclock?

OP, post at what resolutions you're going to be playing at.

tf/resource/ui/HudDamageAccount.res
At the top there should be "CDamageAccountPanel"
Edit "PositiveColor" and "NegativeColor", for example:
"PositiveColor" "255 255 0 255"
"NegativeColor" "255 255 0 255" and it'll become yellow.

Are you using custom crosshair for your +? If you are try this, go to your ClientScheme.res which is in your tf/resource folder and find your + crosshair, it should be something like this:

"CrossHairNormal"
{
"1"
{
"name" "Symbol"
"tall" "32"
"weight" "0"
"additive" "0"
"outline" "1"
}
}

If it's not already there just add "outline" "1", it'll add a black outline around your crosshair.

http://www.youtube.com/watch?v=jx7PjrMQShI&feature=plcp

As already mentioned before, it's personal preference. If you're used to the default rocket launcher, use it, I don't see any point in changing over to Original.

mat_picmip ~8, you can only set that by using http://teamfortress.tv/forum/thread/1920-openplugin

- Warm hands.
- Don't play the game when you're in bad mood.

You might want to add outline/dropshadow to the damage numbers font, so it's easier to see.

May I ask why do you need 16 GB of RAM?

900 DPI.
1.34 In-game.

34.6cm/360
13.6"/360