Hey guys. i was wondering if i should upgrade or get a new build my budget is $300 for an upgrade or $800 for a new build.

My specs are: Antec 900 case, Biostar Tforce 570 SLi, Apevia PSU 520W, X2 3600+, 7900gs, 2 HDD, combo drive, 2 GB or RAM (4x 512mb), XP sp2, 22" monitor

Upgrade: i was thinking of just buying a new GPU i already bought an antec 650w PSU its coming tomorrow. i was thinking

1. 8800GT (or what you recommend) $120 on newegg
2. Athlon x2 5400+BE (or what you recommend) $85 on newegg
3. Motherboard with 770 or 790GX (or whatever you recommend) $100-$150 on newegg
Total = $300-ish

That or a New build? i kind of dont want to build right now seeing as how AMD and Intel are coming out with new products. but i heard AM3 chips work on AM2+ boards cuz all AM3 adds is DDR3. thats why i prefer to stick to AMD unless you can get me an $800 Intel build with the newer processors.

Nehalem is coming out soon. I would just upgrade for the moment and wait for Nehalem to become mainstream, a year or so. Then do a new build.
Your motherboard is okay for the moment. Like auscanzuku s said I would upgrade Processor and video card. That power supply should go. It is a danger for your investment. Get a Corsair PSU.

Top Tier PSU:
http://www.tomswiki.com/page/Tiere [...] ngs?t=anon

http://www.xtremesystems.org/forum [...] p?t=108088

http://www.anandtech.com/casecooli [...] spx?i=3359

http://www.jonnyguru.com/forums/showthread.php?t=1460

Silent PSUs
http://www.silentpcreview.com/article699-page1.html

AMD Certified PSUs (Single+Crossfire):
http://ati.amd.com/online/certifiedpsu/index.html

Certified SLI-Ready Power Supplies
http://www.slizone.com/object/slizone_build_psu.html

Or drop the 8800gt, spend a little more for the 4850 and get that Black Edition chip and your set. Or newegg had the 5000+ x2 chip for 66.00 dollars at retail recently. Not the black edition, but certainly faster than what you've got, and you could probably get a bit of overclock out of that, that would free you the extra for the 4850.