Hello Jagberry,
Hope you are well.
With a set of bookshelf speakers you will not have a full range setup when listening to stereo music.
I own a set of M2i that I use as my center channel. I have also used them as mains without the sub while listening to music, although they are very clear from 80Hz on up, they sound very small without the sub on. When listened to with the sub they sound fantastic, and crossover beautifully at 80Hz. The M22s are very similar in frequency response, but go a little deeper and louder. If you listen to stereo music you will want a sub before the center channel.
Check out my thread on the M2i's as a center channel, if that route appeals to you.
As far as a sub overpowering the M22s, that is not going to happen, unless it is not calibrated properly.
My recommendation for a sub in your price range is an SVS 25-31PCi 320 watt cylinder sub +/-3db 25Hz-100Hz.
Later,
TonyM
