If it was me, i'd get my self a raptor 74GIG or wait a month till the 150GIG version comes out.
I like speed over size.
Also the PSU there is a 520WATT OCZ powerstream for 120$, it's about the same, but it's sli enabled, and has a sweet GREEN LED.
Or get the 600WATT version for 180$, lol or wait for the 800WATT version to come out in mid march.
Aswell, I heard that some games, (in the near future) will require dual core CPU's, Im not totally sure about that, but if your spending that much, you just might want to do a bit of research, on that topic.
Otherwise killer system
And sorry for makeing it such a long post lol.