Do I bother - disk failure pt II

So the disk has largely failed. I recall now why the machine boots from the non-RAID disk - it's because the drivers for the RAID disk are more than a little awkward to load during the recovery/repair step in Vista.

So a new 2TB disk (how the heck am I going to back that up?) disk is on it's way, now i could just stick this in as my .5TB disk was and have this one boot vista off the RAID disk or I could bite the bullet and take this opportunity to do a fresh install of windows 7 on a completely new disk.

Do I bother fixing Vista? Kind of feeling if I'm going to invest the time might as well get the upgrade out of the way.