So I finally bought a controller to run 4 HDD's. I currently have a 40gig, 120gig, 250gig (new one).

WindowsXP is on the 40 and it is causing errors everytime I start up windows so I am re-formatting/installing windows.

Now I have the vista Beta version, and XP Pro SP1. Do I:

Install XP Pro on the 250 (have a small 8gig chunk for XP and programs)
Format 40gig, install XP and NOTHING else
Install Vista on one of the drives?

What is the smartest option?