Striping vs Raptor

Re-installing Vista Ultimate x64 soon enough (kinda broke my old installation... needed an excuse to do a fresh install anyway) and I was looking at a few options for hard disk management.

Right now, I have 1 150gb WD Raptor, and 2 500gb WD Caviars in an Asus P5KC board (which doesn't do RAID nicely from what I've heard) and I was simply wondering what setup would be the most efficient for gaming (things that do a lot of loading pretty often, MMOs jump to mind straight away - World of Warcraft and the upcoming Warhammer one, as well as offline games that like to take quite a while to load, like Supreme Commander).

I'm not worried about losing data, the only thing that even slightly concerns me is my music collection which I always have 'backed up' on my mp3 player, I'm just looking for quick boot times, and good response rates. Ideally I'd like to not sacrifice 500gb of space too.

Was looking at the striping option in Vista, and was thinking about basically striping my 2 Caviars, and leaving my Raptor as it is, since it'd only be held back by the lower RPM of the larger drives (as far as I know anyway).

One last thing, just entered my head, with 2GB RAM (upgrading to 4GB in the new year) would I be better off making a seperate partition on the Raptor for the page/swap file, putting a seperate partition on striped Caviars, or just putting 1 on each of the 2 options?

Thanks in advance