The other thing to consider with maggies is the power. They love power and the bigger you go the more power they can take. You don't mention what amplification you have or are considering but, in my opinion, the 3.7's I've dealt with sounded much better on a good 200wpc amp than a 100wpc amp. I suspect the 2.7 would also be in this category.
With that said, I'm sure others would agree, if you go down to the 1.7 or below a good 100wpc amp will do fine.