Ah. I finally did what I needed to and talked to one of my potential roomates. Asking is the hard part; with that over I get to sit back and relax.

If he says no, then I just move down the list to the next roomate.
If he says yes, I'm done.

Either way it's wonderfully out of my hands at the moment, up in the air somewhere. For someone who just asked a near-stranger to be his roomate, I'm remarkably relaxed.