Now here's a first post I can respect.
Very nice job, one of the better explanations I've heard of what you want. You also look like you've done a lot of research, excellent work here.
Firstly, what you've designed here is fine. You could go ahead and get this stuff and you'd probably be just fine. The only things I can offer here are my opinions on some of the things you've chosen, and maybe some alternatives.
The CPU is spot on, definitely a good pick there, no question.
As for the motherboard, I know you're trying to save money and not pushing the OC too far, but you should be wary of cheap motherboards. My first custom build, I went with a "cheap" $100 motherboard, and I had problems for the next 3-4 months with it. Since you are
overclocking a little bit, might I suggest the Biostar 965P
. Its reputed to be one of the better overclockers in the $100 range. Don't be put off by the Newegg reviews, I learned about this board from the highly respected [H]ardForums, and someone on XtremeSystems also used it in one of their overclocks. A similar board is the Foxconn P965
. Can you tell its an all 965P show in this price range? I know what I'm recommending is about $30 more than what you were planning on, but I really would like to see you avoid a lot of pains with a sub-par motherboard, haha.
The Case and Power Supply are again great picks. Yes, 480W with dual 15A +12v rails should be more than enough for what you're planning. And that case looks sick.
The case fans were just something I had to comment on. While the look crazy, notice in the specs it says that they put out 35dBA of noise. Well, I have a two 35dBA fans in my case, and they produce a fair bit of noise. Enough that when I turn it off, I can notice a sickly difference in the noise in the room. Also when I take my noise-cancelling earbuds out, its a sad realization for me. You could try to look for some quieter fans on Newegg, there's a filter for them, I believe. But still, like I said in the beginning, you could keep them and still be quite satisfied with your system.
Hard Drive is also just peachy. Notice that everything I'm saying is very minor and that you've already done a great job of picking parts.
You made a smart decision with the memory going with a 1GB stick, letting you upgrade to 2GB in the future without clogging up your case with 4 x 512MB sticks. It actually duped me for a minute as I was about to recommend 2 x 512MB for Dual Channel, but upgradability comes first.
Just an alternative that I'd recommend to the Wintec is this Patriot Signature 1GB DDR2-667
memory. The Wintec looks fine too, but Patriot has a much better reputation. Plus, it's also a bit of an overclocker, so it'll help you get to that 2.4Ghz overclock. Plus, its the same price, so shouldn't interfere too much with your budget. The lack of a heatspreader isn't really an issue as RAM will NEVER get hot enough to need one at these temperatures. Even at high DDR2-800+ speeds, a heatspreader is mostly there for looks.
The videocard is the exact one that I would've recommended for your system, so you've again done your homework. You had some questions though, so I'll just clear those up. Yes, the eVGA 7600GTS is the exact same thing as the rest of the 7600GTs, so you don't have to worry about that. The 7900GS is an excellent card for the price, but you don't have to push that far for one. Bit of an overkill thing for your system, especially at 1024x800 resolution.
As for the eVGA rebates comment, I don't know who could've told you that. eVGA is basically perfect in every way as far as most nVidia enthusiasts are concerned, and their rebates are better than other one's I've experienced. Rebates traditionally take a long time and are a bit of a harrowing process, but eVGA is no worse than anyone else. But still, no reason for you to deal with any unnecessary rebates, the 7600GT[S] should be fine.
A good long post deserves a good long reply.
Everything I've said up there are just little tweaks to the build to make it optimal, you could go ahead and get what you originally planned and be just fine with it.