A couple of comments :

1. Definitely take the subwoofers out of the equation when comparing prices. Matching the mains, center and surrounds is important but there isn't much need to get sub and other speakers from the same vendor other than matching finish, although matching the finish IS often important if you are putting the system in a dual-purpose room rather than a dedicated HT room.

2. The Polk and Axiom subs you chose aren't in the same league -- from eyeballing the specs I think even the EP350 would be more than a match for the Polk 505.\


M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8