My Recommendation: (Not obligation)
GPU: Wait for Radeon HD 5850 or 5870 with DX 11
Form Factor: standard ATX
Memory Type: DDR3
Motherboard: New Core i7 or Core i5 motherboard or AM3 motherboard with new RD890+SB800 (Core i5 P57 motherboard comes in 2010, the successor of P45)
DirectX: 11
Max Resolution: 1920x1080 (FULL HD 1080P resolution) See ACER H213Hbmid and ASUS VH226H monitors.
PSU: For the moment, the newest OCZ Z1000 has "80+ Gold" certificate/award which is the newest and most energy efficient PSU which will lower your electricity bill and save you more money.
Please note that if you want DX 11 GPU and AMD RD890 with SB800 motherboard or Core i5 P57 motherboard then you have to wait. It would be great if you can wait and get something that is new and can last much longer.
If you wanted to quickly get the motherboard then Core i7 X58 motherboard would be the best choice for you like ASUS P6T-Deluxe or Gigabyte GA-EX58-UD5 or get the cheaper X58 motherboard. Also, always check the rating of these products before you buy them on newegg.com.
Good Luck!