Why not wait until around two weeks before the release date before upgrading you rig, like me? We have six months until Skyrim hits, I'm pretty sure there will be more and better upgrades to get between now and then.
because I did not upgrade for Skyrim, I upgraded for the Sims 3 which I have now. plus I upgraded from a GTX 8800...BIG difference!
and my 8800 lasted about 5 years (which I did get for Oblivion) so I figure the 460 should last just as long. and I figure that the upgrades between now and then for the price range I would want would not be worth waiting for anyway.
Heck, I only learned about Skyrim AFTER I upgraded my PC anyway! LOL!
I still stand by my original decision to mess with the graphics though, I love playing around with settings.