I am planning on purchasing M22's, VP100, M2's, and either the ep175 or ep350. I'm mainly concerned about which subwoofer to get. Really the only other home sub I've spent time with is a paradigm pdr-10. How much improvement would I likely see with an upgrade to the ep175? ep350? Also the pdr-10 is in a large room whereas the axiom will be in a much smaller room.

I'm trying to put off buying as long as possible so I can learn more about home audio, but it is tearing me up inside! I got an RX-V2600 a couple months ago and up until two weeks ago it was powering some logitech computer speakers... Now it is doing nothing until I get the axioms. Obviously I'm following a slightly different buying philosophy with the speakers, ha. I had to get out of the car audio scene, after the one millionth post asking how to wire two 4 ohm subs into 2 ohms I knew I was in the wrong place.