Ok im looking at the list here and what a experience this guy is having XD
I Actually SAW A gtx 285 IN A LIST= FAIL SORRY. Its a pointless money scrounger now get with the ati 5000 serious now
I say get a Phenom II AMD 945 processor
grab some ddr3 sticks at 1600 Mhz and at least 2gb of it
grab a HD 4870-4890 or ati HD 5850-5870 now the HD 5770 is dx11 but you need to overclock to hit HD 4870-4890 performance. and the HD 5850 blows everything away, and HD 5870 is just silly for 20inch monitors.
Get a 1tb lets not get in gb right now 1tb is like 5-20 bucks more expensive then a 640gb plz???
Grab a case with air filters, if you like looks a side window, and at least 2 120mm fans in front.
Wire Management is also great to(its holes precut around the motherboard for easy wire cleanup and threw put making it looks dam sexy and perform excellent.
If you get a p55 i do understand your choice because new motherboards with sata 3gb's and usb 3.0 are coming out and i don't blame you i would rather get that.
Find the prices for your self but i can get a rig like that for 900-800 dollars without mouse or keyboard and monitor and Operating system(i torrent my 2 copy's of vista and XP and windows 7 beta and eventually windows 7).