What would be the best laptop for FreeBSD?

[rex]

Currently I'm running FreeBSD on a HP pavilion desktop. But this desktop belongs to my room mate and he'll be taking it with him in a month or two. So I'll have to buy something to run FreeBSD. Now I'm not able to decide between laptop and desktop? Problem with desktop it would not be portable and problem with laptop, I doubt I'll be able to run it for days without powering it down.

Is anyone out there running there servers on laptops? . If yes which laptop would be best?
My roommate has HP pavilion laptop and it heats up too much, so definitely not HP laptops.

And I'm more inclined towards buying a laptop then desktop.