I am in exactly the same boat as you, my little core2duo e6600 is aged and so is my BFG 9800GTX+.
I think I am going to push for a nice solid 1366 build before Jan, the reason being is that 1366 is still a way off from being replaced and, if you're in the UK, the VAT will rise in Jan.
My build so far is as follows;
NZXT Phantom
NZXT Hale90 850W PSU (mainly because it matches the case)
Asus TUF Sabertooth x58 Mobo
Intel i7 950
Mushkin 6GB Ridgeback 998826 (having trouble with a place to get this from, aria still do not have stock)
Noctua NH-D14 HSF (will need to lose the side fan on the case but its worth it I think)
MX-2 Thermal Compound to replace the provided, never seen any provided compound that I like so...
Mushkin Callisto Deluxe 60GB Sata-II SSD
The only major dilemma I have at the moment is what freaking GPU, 460 range would be ideal but I need to spend some time and go through a massive amount of reviews. On top of all that I need to decide whether to run dual 460 and figure out if the PSU will play nice when doing so.