I'm only a student, so finance details would be worse than irrelevant, but one piece of advice:
Don't move in with people you think of as friends.
Twice, it hasn't worked. This year there were three of us, and we needed one more. One of the others had a friend I thought was a bit of a dick, but we didn't dislike each other. After five months the guy I thought highly of is getting right on my tits, and the douche is turning out a proper brick.
Not to say move in with someone you hate - but think long and hard about how much exposure you can handle of your friends' irritating qualities - ESPECIALLY messiness, if you're a keep-things-orderly type.