I have the M80's and I can tell you that they do carry good bass. Although that may depend on whether or not you can set your crossovers low. I keep my M80's set at 60hz so and they sound good.
I prefer to listen to music with my subwoofer on but once in awhile, depending on the songs, I forget to turn it on and don't really realize sometimes until I'm playing something where I know the bass should sound deeper.
Without the sub, I think you'll be pleased as long as you could set your crossovers lower. The M80's do have good range.
