Intel i5 2500k Sandy Bridge
Intel Z68 Motherboard
Corsair XMS3 8 GB (2x4GB sticks) 1333MHz
Corsair 850W PSU
OS: Win 7 HP 64-bit
Budget: Very Flexible: $100-500
Right now I'm using a GTX 260, and I'm looking to upgrade, I want to run most of the games I play on ultra settings(Starcraft II, World of Warcraft, CoD, etc) @ 1650x1050 res(due to 22" monitor) with the FPS holding steady at around 50-60 FPS+.
Before I ran out and bought the most expensive card(s) that run these games @ 60FPS on like 2560 x 1600, I figured if I'd ask here first to see if there's anything to suit my smaller resolution needs.
If you opt for a GTX 560 check the specs very carefully, they are not all the same, some have a reduced memory transfer width and should be avoided at your higher resolution.
Maximum to aim at would be a HD7850 or GTX560Ti (448 core) but bear in mind, some E-tailers are selling off their 'old' stock, do n't be afraid to bag a GTX570 for a knockdown price!