Ok that psu needs to go. Antec generally make decent psus, the smartpower line is an exception. How much upgrading in the future do you intend to do, or will you next time just build a whole new pc as well?
if your gonna get a 8800gts then shoot u better not cheap out on a powersupply look for a silverstone powersupply or corsair or the antec trio 650w or better yet look at mplichfamily's thread he has some good powersupplies listed
I would get the 3600+ (Brisbane) instead of the Windsor for better overclocking. I see some people are getting nearly 6000+ speeds out of that thing (3 GHz) with good heatsinks.
That PSU isn't too great. If you like Antec, get the TruePower Trio for 89.99 instead. You'll appreciate a better PSU when you try to move up to an 8800GTS.
AMDs perform much better with DDR2-800. I would get this G.Skill instead. It costs a little more but will serve you better.
You might also want to consider the X1650 based cards instead of the 7600GT, unless you plan to use EVGA's step-up within 90 days. Usually better deals can be had on the X1650s, and performance is about the same.
No need to use AS5 compound if you use the standard AMD heatsink, it comes with thermal compound on it.
Definitely upgrade the card to a 7900GS - wipes the floor with the 7600GT (almost 30% faster in 2142).
Don't skimp on the PSU, as others have mentioned.
Can you post prices next to your selection of parts so that we can get a better sense of what needs replacing? Not many of us like to research someone's post.
I play those 2 games mainly with my setup (BF2 & WoW). I get about an average of 45-50 FPS in WoW at 1440x900 4AA 8AF max settings and about 40 FPS in BF2 at 1280x960 no AA with everything on max except dynamic shadows on medium.
Be sure to check out the local fry's ads as they may put out a E4x00 or E63x0/64x0 combo with motherboard for under $200. Although mine is AGP, I picked it up for $130 which will hold me out untill whenever I decide to purchase a new video card (I'm sitting on the fence for now). They have good combos with for under $200 with boards that support 667 RAM and PCIe just keep checking - since you'll be waiting one more paycheck to purchase.
Another good thing working for you is that there may be a chance on a rebate or two by the time your 2nd paycheck comes around. Keep us updated and good luck.
If the x1950pro can be bought for less than a 7900GS, jump on it - it's definitely a much better card. I didn't realize that there was one to be had for less than $150 but i just checked newegg and they have a sapphire for $125.
Also, he is choosing to build a budget system, if he goes Intel, he will have to spend another $50 more unless he catches a deal at fry's.