I really like Maine cattle... we've had a few heifers in our herd over the years, and they've had good marketable calves, and a few show calves as well. In fact, while I'm shopping for that "Perfect" Simmental bull to replace the one I lost in December, we've got a reg. Maine running on the cows.
I think the biggest market for Maines is probably the club calf market, but don't overlook a Maine for a good pasture type animal as well. They are generally quiet natured, and good growthy calves.