You have 30 days to decide. You could just buy a set of 50’s, and if you decide you don’t like them or feel the need to upgrade, Axiom will send you another set with return shipping on the first set paid (well, I think they will anyway). Or, you could just buy both, and send one pair back, and then you’ll never have to wonder if you bought the right set.

I’d figure the mains out first, then get the center as funds become available.