Skyrim was my first time playing TES.
I've heard fantastic things about 'modding'.
You can fix technical problems, add new quests, weapons, spells, and can just create way more game content.
I'm going to buy the best computer available when the creation kit is released.
Best available computer, eh? Well that's fine if you have a couple of thousands laying around. Yes, these games (TES, Fallout) are much more well suited to PC, with the mod support at the head. But I dont think you should fork out some quite a bit of money for mod support. At the cheapest, you'll be looking at atleast £150 or so for a computer that can run it. Try it on your computer, it's not that hard to run on low.
But otherwise, just stick to PS3.

Also, Kuba17; you're telling me. I have a quadcore, 1gb gpu and 4 GBs of RAM and I can only just run it on low, with textures on high. I found a old thread on the forums saying the settings to have and it massively increased performance. PM me and i'll PM you the details.