If your looking for something a little less cost, this one is a popular choice on garage journal
http://www.dannmar.com/dannmar-products.html
Main thing is to make sure he has the spread width figured right. My buddy screwed up; He has like I do, separate garage doors for each bay, the problem is that the bays are very close to each other (about 2' between each overhead door) In the garage interior the posts sit very close to the plane parallel of the next overhead door making it challenging for his wife to park a car if she does not drive straight in exactly. Since Im writing of his problem your probably know what she has done in the past.
Chamberlain Liftmaster makes a great side mount lift eliminating the center overhead track.