Where abouts do you live? I usually find some decent parts on Craigslist once in a blue moon, but mostly close to this time of year (due to Black Friday and Xmas). Otherwise, I usually get them from people with good Heatware (Overclock.net and [H]ard|Forum). Sometimes from here, too.
- 1080P gaming with above average FPS (assuming 60Hz is your target) - This will depend heavily on your graphics card. Some games will also depend on your CPU. Some recommendations: GTX 780, GTX 970, R9 290/290X
- Sports, Racing, and RPG games don't really need a powerful graphics card. I sometimes play those games at highest settings allowed on my 60" Plasma HDTV (1080P) and all I'm using is a stock voltage overclocked GTX 950 2GB. In-game benchmarks for NBA2K14:
Frame Rate: High
Resolution: 1862 x 1048
Refresh Rate: 60
Window Mode: Off
Anti-Alisaing (MSAA): 8x
Anti-Aliasing Quality: N/A
Crowd Detail: High
Sideline Characters: On
Texture Quality: High
Depth of Field: On
Floor Relection: On
NBA2K14 Benchmark FPS: 116
- Wired, your standard motherboard should do it, for wireless, most motherboards also have decent 802.11ac support. You can always get a better adapter, anyway (but at the extra cost).
- Audiophile level sound, find a Creative Labs Sound Blaster X-Fi Titanium HD for $60 and upgrade the op-amps for $10 and get a JDS Labs Objective 2 DIY kit for $59, and any of the headphones listed here
in another thread, and you're in audiophile territory for around $250.
- CPU-wise, your Phenom X4 9550 should still rock as far as your needs. Otherwise, find some used 2500K/3570K/4670K/4690K's for sale. Bought a 2500K a year ago for $80, and a 3570K for $100. I haven't needed to look since, but I'm sure there are still quite a bit out there. Hitting 4.6GHz easily, or 4.9GHz if I really want to push it to it's limit.
Hope that helps.