oh man...
well around these parts I'd say my first choice for a Boston venue would be the Roxy. Its standing for a concert and its actually quite an ornate old room. Holds about 1500 for a concert.
But I'm sure he'll end up at the Orpheum again which is fine - Moz has a liking for it because Oscar Wilde once stood on that very stage, which he makes a point to mention.
Longshot - the Portsmouth Music Hall here in Portsmouth, NH. Yes its right down the street from my pad but its a very nice old theater, holds about 1000, and has been recently refurbished. We have had some good singers come through over the years, though "rock concerts" are not really its primary focus. However, Joe Jackson is playing there soon and I saw one of my LOUDEST concerts ever there - Steve Earle and the Dukes about 3 years ago.
Bottom Line - I'm just dying to see him again somewhere.....