Between driver availability and other limitations, would you all recommend Vista 64 over XP 64? I have a copy of XP 64 and Ubuntu 64, but I'm not sure which I should go with. Is Vista 64 going to use similar drives to XP 64 or are they different? I've got a few drives lying around so I might test them all. Please overlook the issue of ease of use, or your personal preferences for an OS. I'm looking at the technical limitations here in driver availabilty and RAM usage. Thanks