I would certainly recommend getting a pair of M60s, and if at all possible, a pair of M80s. The M80s are superb, and they do go down to 34Hz, so you can postpone buying a subwoofer for a long time! But you do need a good amp to drive those 4ohm M80s.

4 M80s/VP150/EP600/Denon AVR-5308 & DVD-2910/
2 QSC SRA3622(1100wattsX2)/Carvin 1800HD(600wattsX2)