I'd say just to build a whole new computer.
BUT.
Intel should be coming out with a new socket later this year...
my suggestion would be to wait for the new socket and processors to arrive..
possibly new video cards too.
Correct me if I'm wrong but isn't it better to build a computer at the end of a year then at the beginning of a year?
I built my computer in December last year and it runs great, only cost like
$1100 Cad, my friend built his in may of last year i know mine is newer but his seemed to get outdated faster...or maybe thats just because he's with amd.
Hope this helps.

Sorry for going a little off topic..