looks like the pcx 5750 is nvidia answer to the x600xt. heres a review:
http://www.hothardware.com/viewartic...?articleid=581
its a budget card, but might be just what you need.
and as for memory, I misunderstood. I thought you were only going to go with one stick of 512, not two. Yes, two sticks of 512 in dual channel mode is the best way to go. but again, take a look at a 1gb kit. it makes sure you are getting memory from the same process and batch, meaning the chips on the stick will be the same brand, made at the same time, in the same vat, etc. doesn't really matter, but if your a purist like me, then you want that extra assurance of quality for $10-$20 more.
yeah, you can always upgrade your psu when you need to, its just nice to not have to think about it whenever you are adding something else. just my opinion.
don't worry about thermal paste. Thermal paste is what you put on top of the processor before you put the heatsink on. This allows efficient transfer of heat from the core to the heatsink fins.
I say don't worry about the paste because with the processor you are buying, it comes with a heatsink with a thermal "pad". The pad is a form of paste that melts on the processor when you run it for the first time. Really convenient for system builders making hundreds of machines, and you are gaurenteed not to screw it up.
However, lots of people don't like the pad, saying its not as good as high quality grease. i disagree, i think it is fine for most users. unless you are overclocking, or running extremely hot otherwise, the few degrees difference is not going to make a significant difference.
If you were to use grease (aka paste, interchangable), you slather a nice even coat over the cpu's top. on a socket A amd for example, I just put a coat on the exposed core. For an intel like what you are buying, im not sure. I think I would put paste as far to the sides as possible. I use a flathead screwdriver and a light touch, and spread the grease like butter on bread.
if you are piecing stuff together check by check, I would buy your case first. No real reason, thats just the first thing I would get, rather than getting all the fun expensive goodies that you can't use. Its a terrible feeling knowing you've got all this cool stuff sitting in your room, but you don't have a case, or a hard drive, etc. don't be tempted to put the new stuff in your current box!
oh and don't wait too long between parts. Prices change soooo fast with computer stuff its not even funny. The memory you buy today could be 10 bucks cheaper tomorrow, no joke. Don't let this stop you from buying stuff, because then you'll never buy it (took me 6 months to finally break down and just BUY.) But just remember, the things that don't fall as fast in price are cases, hard drives (with the exception of best buys rebates), monitors, and power supplys. video cards are next, then processors, mobos, and memory is what really starts to fluctuate. just what I've noticed.