Hmm, that's a hard thing...well, if you honestly think things well be better to go out with your ex again, go for it, because he sounds like a good guy, and well, he's living closer to you now. However, I would also think about giving this other guy a chance, he sounds like a good guy. It's always nice to leave your options open and try something new, you never know, he may be better than your ex.
Now, I wish I could just tell you who to go out with, but ultimately it is YOU who has to decide that.
If worse comes to worse make a list of pros and cons between the two, and decide that way?
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Come on baby, let's go!