Personally I think I'll upgrade my graphics card to a better model, seeing as otherwise I would have to resort to playing Skyrim on low. As a result of this I'll have to buy a new PSU though, but I bet Skyrim will be worth the extra ~200 euros! Besides, it'll make sure my PC can last a few more years game-wise.
Sorry if such a topic has already been posted, I didn't find anything scanning the first few pages.
Edit: If you are wondering about your PC specs or looking to upgrade/buy a new PC, this is the topic for you! - http://www.gamesas.com/index.php?/topic/1242901-unofficial-will-my-pc-run-skyrim-discussion-34/