[canttouchthis]

I've found Vista in my experience to be just as stable as XP. It just doesn't get solid performance.

yeah your computer is probably set, although I'd think twice about overclocking that prescott. They run really hot as is, and you won't see a gain in vista really. SO unless you get wicked good aftermarket I'd leave it stock.
oh and service packs dont really matter. They typically just include all of the updates in one file, and they consider the operating system a different version then. I'd be more worried about updates to your probelms if you have any than service packs.