I have Boston Pro 6.53s up front. They were Boston's old 3-way component set which consisted of a 6.5" midbass a 4" midrange and an aluminum dome tweeter. I am bi-amping them with JL 300/2s.
The best advice I can give to you is to audition some with your favorite music at a reputable shop or better yet listen to some that are actually in a car.
Boston might not get all of the hype and have the panache of say Focal or MB Quart but they make some pretty nice speakers that are very reliable.
Boston also has some of the best customer service in the industry. Feel free to e-mail them or call them up to talk technical stuff and they will do all that they can to help you out.
