Approx total - $460 (GTS 450 + Spinpoint F4 320GB) or $470 (Radeon 5670 + Spinpoint F3 1TB)
Budget - $500. Less is better.
Purpose - Gaming at 1680 x 1050 or better (max resolution is 1920 x 1200).
Preferences - Everything runs at stock, no overclocking (unless it comes that way). Quieter, cooler & smaller is better. I somewhat favor Nvidia due to more robust drivers (on XP at least) and also because very many games still seem to favor them as well (The Way It's Meant To Be Played). I'll give ATI/AMD a try if it's a good deal though.