I built nearly the same system.
I ended up going with a SanDiego instead of the Venice and I went with the 6800GT.
I also got the Modstream 520W, I got P160 instead of the P180 (I just liked look more and it is cheaper) I got the OCZ Value VX as well, which I will warn does run hot when running 3.2V through it.
I think if I was buying right now the only things I would have done different is I probably would have got a Venice just because the cost for the cache doesnt seem worth it. Also I am starting to think I should have got 2x1GB sticks instead (with nice timings), even though I don't "need" 2GB right now, in the future when I do drop another 1GB in I will end up dropping to 2T (4x512) which will suck.
Overall it looks good, if you are happy with 1GB of RAM stick with the VX because it is good RAM. I would get either the 6800GT or the x800xl depending on price as they are both good cards, although with the 6800GT you have the future option of SLI.