Double-check prices on newegg.com, since that should let you see where you might be able to make a jump in performance for not much $$$. For example...
I'd go for a slightly faster cpu. I'd try to get either the 4600 (200 more mhz for $20, not bad) or make the jump to the ones with 4mb of cache instead of the 2mb in the 4500 and 4600. But that's just me.
I had good luck with g-skill memory. Sometimes it's a bit cheaper than crucial. Look into a 4 gb kit too (2x2gb). Yea windows won't use all of it now (you'll probably get 3gb usable), but you keep your computers around so long that the NEXT operating system just might be able to use all 4 gig. And memory is cheap right now. No matter how much you get, try to get memory speeds that match the cpu bus speed.
I'd get the 500 gig version of that same samsung drive because the price/gig bottoms out at the 500 gig size. I have 6 of these (4 in a RAID NAS box, 1 in my main rig, and 1 in an external USB chassis) and they all run fast, cool, and quiet. You should pay about $115ish for the 500GB version.
For a power supply, I have had very good luck with seasonic. Every review I've read, even the ones that stress the power supplies up to 100% of rated power in a hot environment, have good results for seasonic PSUs. They cost a bit more but they're also very quiet.
The 8800GT is a good video card. You'll be able to run a pretty high FSAA setting in AH with that sucker
![Wink ;)](http://bbs.hitechcreations.com/smf/Smileys/default/wink.gif)
You will want a decent power supply plugged into it though.