Actually solved this without any extra hardware...

Opened my box and removed power from 3 of the 4 drives, leaving only the naked drive enabled. Installed Windows XP to it.

Hooked everything back up, and my bios has a boot menu that you can choose which hard drive to boot from. So if I choose the drive with XP I get XP and if not, I get Vista, no boot manager bullshit and no having XP installed on the E drive which is what was happening when I tried to dual boot.