Not sure if you are going to overclock or not, but if you are the
Ballistix 2x1GB PC-5300 would come highly recommended, also a tad bit cheaper if you would by them this week.
I see you have opted for the Hitachi HDD's, personally never used them, more of a Western Digital user.. would have taken a
160GB for OS and a
320GB [or maybe even
500GB depending on how much applications/games you will have!] for applications/games. Also, if you download a lot, some extra space is always good to have before you are able to transfer it to an external drive!
The CPU is is overkill if you only going to have a GTS card, 2 HDD's and a Optical drive.. go for the
Corsiar HX 520W. it will be plenty enough! And £30 cheaper!
Otherwise everything seems ok, I am sure you can use the E6600 from your existing system and the motherboard will support the new Penryn Processors when they come out later on so keep that one!
Cheers
Tom
Edit: Beaten by Semi-Pro!