DYNAUDIO EXPERTS Pro line vs Home Audio line

Maybe you guys could kick some information too me in this comparison. I have a pair of MKII 1.3's and the contour center. I was looking at putting together a 5.1 setup. I was hoping to retire the MKII 1.3's to the rear channel and buy a set of Dynaudio 52SE or 1.4's for the front. Basically I am just looking for something that will outperform the MKII 1.3's (though they are very pleasing) Anyway, I looked at the BM15A's as a possibility as well. Would they suite in this enviroment or am I way off base. I was thinking that they would be a good way of getting a bit more depth with the size of the driver. I heard rumours that the BM6 was a takeoff of the MKII SE (even though the specs are different). Is that true? Whats your thoughts... I do not want to go with a floor stander though...