I own DD, have used M3's and actually I think you get a better "cost" deal with the M3's....you can buy recones all day for the M3's that take only minutes to recone....vs. the DEE DEEZ that are a a bit more of a lengthy process to recone. And dont be mistaken, the M3's do sound good and get fawkn loud if in the proper box with some power behind it.
oh and on a side note, I got an official email today from DD saying the 9900 series is no longer available ... :GASP: //content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif
so the 9500's with the upgrade kit will be the highest sub DD makes thats anywhere near being reasonable to afford.