I replaced my M50s with my M80s. Before that, it was Cambridge Soundworks Ensemble 1, so not exactly anything to write home about. But the cabinet volume of the M80+the 2 6.5" woofers makes for pretty darn good bass. That said, I always use my sub, since I like a lot of bass.
Well all of my music listening will be either internet radio, mp3's or some dvd/bluray music discs.
But the music I enjoy will have alot of deep base that I want to be able to "feel".