You don't need to spend 3K to build a great box.
This cost me $800 and COD4 loads in about 4 seconds.
Windows boots in 10 and comes out of sleep in 2 seconds on this hardware.
Get a good silverstone case from frozenCPU.com and keep that. Upgrade it periodically with fresh guts.
See the case I use, lower left here:
http://madlinux.com/pics/newpc.jpg
Check priceWatch.com for the rock-bottomest prices.
Water coolers haven't evolved enough to bother.
1. Motherboard: EVGA P55 Motherboard. (supports intel i5 and i7 CPUs. ~$180)
- SATA II ports, fricken fast!
- Onboard sound, 2 Ethernet ports, lots of USB ports.
- Supports 1300 MHZ DDR3 memory.
- Can be overclocked for really fast performance. Sweet stuff.
2. EVGA Nvidia GeForce GTS 260 Video Card. 1GB. (~$220)
3. 4GB Standard DDR3 RAM. ($100)
4. 64GB or 80 GB SSD Drive. (300 MBps read and prices are dropping like lead. $200 for the 64GB Intel)
5. 750 Watt power supply or you can reuse your last power supply. ($60)
6. 1TB Disk drive for movies, data, whatever. Can also use your old. ($80)
drive if it's SATA.
7. Windows 7 OEM Home Premium 64. ($104 for the full OEM version. Good deal. OEM Means you can pay a license fee for each computer onto which you install it past the first.)
Video Cards:
http://www.pricewatch.com/video_cards/
Motherboards:
http://www.pricewatch.com/motherboards/
CPUs:
http://www.pricewatch.com/cpu/
Else:
http://www.pricewatch.com/
Cases, power, fans/cooling:
http://www.frozencpu.com/