Wow I don't know where to being...
I guess i'll start with an X2 is inferior to a C2D these days. An E6300 is all you would need and will save you 60 bucks. Or get an X2 3800 as in terms of dual cores these days you wont notice much of a difference. This way you wont have to get a whole new motherboard.
Then another thing is your screen. Get a Hanns-G 19 inch. They are only 180 bucks and amazing screens. That saves you 90 bucks.
Thats about the best I can do..
E6300 w/ Arctic Freezer Pro 7 @ 3.6ghz 1.4Vcore
Antec 900 Case
EVGA 750i FTW Mobo
4x1GB of G.skill DDR2-800
2 8800GT in SLI
22" Samsung Syncmaster
1 250GB WD and 1 Seagate 7200.10 in RAID 0
Corsair 520HX 3DMark06 Score: 13900