I've been using the International Bike in Brighton just because it's close to where I live, and they've been ok so far for wheel truing and spoke replacement in a hurry. The new place right on Comm Ave, landry's bikes seems pretty good. I was in there today buying shoes (got a pair of sidis :-P ) and was impressed with everyone I talked to. Plus they give you a discount if you're a member of massbike.