I just purchased an Axiom setup, but I already had an Adira Rava sub. One of the best subs for the price, $399, sealed 12" 250W. Just do a search on any of the home theater forum sites and you will find lots of info on it. I just got the M60, VP150, QS8 and the sub fits right in with it. I got the sub in back so it doesn't match my nice boston cherry Axioms but black works with most speaker looks. Performace wise I think any quality sub can be made to blend in with other speakers. As long as its calibrated to work with them. Just look at all of the SVS owners out there.......
