I could not agree with Tim more, and I completely agree with AAAAAAA. If you do not hear it yourself you can not have an opinion on it, but without others to make recommendations and you live in the boonies you are screwed. I would get on my horse and drive 3-5 hours to hear a certain set of drivers (and have often done just that). Now what this thread is about is called networking. Does anyone within 3-5 driving hours of guk2 have the drivers in their car? If so then he could go and listen to them in an actual install.
Me I like Diamond and don’t care for the recent Boston’s I have heard, but I haven’t heard them in a car. MBQ is a very polarizing speaker system but high quality.

 

Hey
In my own opinion the BA 6.4's sounded more neutral than the 6.5's. One shop locally has both models in a display board but that is no where near the sound installed in YOUR car.
If you want to compare them and can't listen to them buy a set off ebay or check the for sale section. If you don't like them you can turn around and sell them without a big loss in the wallet.
J