I will start off by saying that I just recently built my first desktop (first time building but not first time owning one). So I am in no means an expert.
I suggest getting a processor that is made with 45nm technology rather than 65nm. These processors should run cooler and more effeciently. As for whats available, you have the Intel Core 2 Duo E8400, which runs at 3.0 GHz for about $170. For a quad core, you have the Q9300 2.5GHz for around $270. I'm also diving into some computer gaming a little bit, and I bought the E8400. So far it seems to run pretty good.
For the Heatsink/Fan, the stock fan should be sufficient if you are not Overclocking. Before you get interested in overclocking, know that it is risky to do, and it can reduce the lifespan of the parts being overclocked. If you want to overclock, then just say so and we will suggest some parts for you.
For the powersupply, I am using a 600W Silverstone, which was suggested by more experienced people on this site. This should cost somewheres around $80 after a mail in rebate.
The RAM you picked seems extremly cheep, and pales in comparison to your other parts. There are two main problems with the RAM you picked. First, it is only 800 MHz. You should be looking more in the 1066 MHz area. Second, it has no heat spreader. I don't know if this is a necessity, but it would certainly be better. The brand I am using, and was suggested to me was Mushkin. However, feel free to look around on your own to see what you might want.
Lastly, you seem to missing a few parts. Such as the HDD, optical drives, keyboard and mouse, and the monitor. Also, do you need a floppy drive and or a disk reader? Finally, do you want this to be wireless or wired for internet? Just provide an update on these things and I will be glad to try to help you out.
Edited by Granz00, 11 August 2008 - 09:15 AM.