Looks pretty good, only thing I see that you may be missing is an aftermarket cooler for the Q6600. You may also want to order from ClubIT or somewhere that guarantees the G0 stepping version as you can OC better on stock voltage.
Also, what OS are you using? If it's not 64bit, then there really is no point in getting more than 2GB of RAM since 32bit won't address more than 3.5GB and on top of that, most 32bit apps won't ever use more than 2GB regardless of the amount that you actually have.
4gb is better than 2gb, even if you only see 3.3gb of it. Why not just start with vista 64-bit? With all new parts, dirvers should not be an issue. Only 16 bit dos programs will not work if you have any.
Are you planning on raid for the raptors? If so, you might be disappointed. Raid will not really improve games. Change out one of the raptors for a large storage drive instead.
Q6600 is a good processor, but very few games can make use of more than two cores today. For the same price you could make use of the higher clocked E6850, or even the E8500 which is supposed to be launched soon.
Are you planning on SLI? If not, you can save some money on a less expensive motherboard. If you are planning on sli, consider the possibility that it might be better to step up the evga card in a month or two when a higher end vga card is supposed to appear. SLI does not give yoy 100% improvement, it is more like 10-50%, depending on the game.
I would also second the rgeist554 suggestion on an aftermarket cpu cooler. It will allow the cpu fan to turn at lower rpm and result in a quieter system. The very best today is the thermalright ultra 120 extreme.