Spark Street Auto Body in Brockton does good work. Or try to look up a Scott Lockhart of East Bridgewater, Mass (his hometown). He's got his own shop in Whitman now (he used to work at Spark Street) but I can't remember its name. He did the paint on my '79 Cobra, my brother's '85 GT, both of my cousin's cars ('82 GT, '84 SVO, and my uncle's '65 Fastback. He knows his Mustangs and most of the stuff he does will end up in a magazine.
I wouldn't recommend the MAACO deal every two years. I recommend doing it once and doing it right. You'll get a lot of pleasure out of a show quality paint job.