I guess you've decided not to use a subwoofer? I think you should revisit that decision. It seems you're passing on some nice speakers because they don't have enough bass. Naturally, the larger Axiom speakers will have more bass than the smaller ones, but you'll never get the bass that's there without a sub.

Greg
VP180, M80s, M22s, QS8(4), CSW S305s, EP500, Pioneer VSX-90
M2i, M3(2), Pio vsx-1020