[Mr frag]

i'm new to this forum so... Hello everyone!

well i have a very simple problem, i bought an alienware pc about 3 months ago i put in it as much hardware as i could afford, i ended up with an intel 2.66 ghz quad, 2 geforce 8800 gtx, 4 gig of ram, a 500 gig boot mirror raid and a 250 gig storage mirror raid.
Because most of my programs only run on xp i payed a little extra to have it with xp... yes it actually cost more!

and here is where the nature of my problem is... as it happens 32 bit OS's cant allocate more than 3 gigs of ram including video ram... so right now i'm only using 2.5 gigs of ram and 500mb of video ram... which is less than half of what i actually payed for

so naturally i need to install windows vista 64 bit... but i want to dual boot it with xp, i've read loads of tutorials on dual booting xp and vista on partitions and separate drives and it all seems very straight forward, but they never mention tackling dual boot on separate raids.
what sort of problems can i expect with this setup?? will i need to install raid drivers for vista?? will i need to unplug the raid where xp is installed?? will the processor even be able to run at 64 bit??