This is my dilemma. I can't really afford to go the M60s route and afford a decent subwoofer. Pretty much my two options are going with some M22s and a decent sub, or going with M60s and no sub. Which do you think would be better?

I should note that I have a 15'x15'x17' room. Not really big, just a high ceiling. Listening area 8-10' from the front speakers. I typically listen to music/movies at a moderate volume.