What head unit should I buy for my xB? Pioneer AVIC-N2 or Pioneer AVIC-D1? The D1 is supposed to fit in the double DIN. The N2 is a flip out. Someone help me please!

depends on what you want to do with it. D1 doesn't play dvd movies for instance. research the crap out of both and decide whats best for you.
i've always hated flip out screens, and i don't want to watch movies in my car, so i'd choose the D1 personally.