How about a third choice? Since you're trying to trim costs a little, you should consider the M22/QS4. The QS4 is now being made with the same tweeter as the QS8. Since your listening area is only 13'x13', you probably don't really need the QS8, particularly since you're trying to save some money.

The M60's need some breathing room to really sound their best. So the M22's (with a sub) will do just fine, and save you money.

Jason

M80 HP v4, VP160 v4, QS8 v1 (3 in 6.1 layout), SVS PB12-Plus/2, Parasound Halo A21, Denon AVR-X4100W