- Noctua NH-D14 is better but more expensive.
- GTX 680 isn't worth its price. Go for Radeon HD 7970 or 7970 GHz. 7970 has 3 GB of VRAM for better hi-res performance. 7970 GHz beats GTX 670 and GTX 680 and it's cheaper.
- 500W, but if you plan to Crossfire, 850W.