My personal recommendation (I just built one of these for a guy in my gun club, this thing ROCKS).
This MOBO is about 50 bucks more than the NEO Platinum you picked out, but worth it IMO.
http://www.newegg.com/Product/Product.asp?Item=N82E16813127196The Abit FATAL1TY board rated great in the Tom's Hardware testing and if overclocking is your thing you cant beat Abit's setup. Not that you need to. This setup works great without it and no overheat worries.
Then the CPU
http://www.newegg.com/Product/Product.asp?Item=N82E16819103501Pretty much the same as what you had listed. Yours is 9 bucks cheaper, go for it.
On the video card, I would really suggest going for the 6600GT instead of the 6600. Actually, I'd recommend you just go straight to the 6800GT, its a far better card. But if money is the key, then spend another 30 bucks and go with the 6600 GT. Its only going to have 128MB of memory instead of the 256 you are looking at, but the memory on the GT cards is twice as fast, and the processors are minimum 200mhz faster. The slower memory on the 256MB cards wont really run any faster than the 128MB card because of the quality of the RAM. Look at the specs on the card you have listed, then look at these two.
http://www.newegg.com/Product/Product.asp?Item=N82E16814125156http://www.newegg.com/Product/Product.asp?Item=N82E16814145098The Gigabyte one is a little more, but I trust their quality. Chaintech is ok too. Rosewill, MSI.......name brands. Anymore, its coming down to a manufacturer quality issue on video cards. Buy from reputable companies. Sure you can get an RMA, but in the meantime you have no video card. PITA.
As for the RAM, I personally like Corsair or Rosewill, or even Mushkin. Even their cheap stuff usually works first time (although only within posted specs). You want stuff you can push, you pay more for it. If you go with no name companies you might save some dough at first, but you usually pay for it in time lost sending the flaky RAM back for an RMA.
With RAM included this rig will run close to 600 bucks. More than you wanted to spend, so in the end your wallet decides how far it can be stretched I know. Still, I think you'll see more increase out of this than what you were looking at. Just my opinion.