Hey salc,
I have reviewed and owned all the amps & 20.7s that you are inquiring about. There is no doubt in my mind, based on my personal taste, that the Coda #16 is my favorite with the Maggies. Remember, your 20.7s love current and the #16 can drop up to 100 amperes of current compared to about 20 to 30 amperes for the 350.8.