I currently have 4 axiom 1.5 bookshelf speakers (2 front/2 rear) ,1 axiom center speaker and a PSB subwoofer (12" ~ 500$) hooked to a pioneer vsx-d606s av-receiver. It's not that I feel that my system is really outdated but I was wondering if the newer generations of speakers are way better then mine?

I have never heard the Mt3ti/mt22ti or the tower models.
The stores near me doesnt carry Axiom speakers and when they do, they only have the cheapest ones.

Would it be better to replace my rear speakers with the QS surround speakers? Would it also make a big difference.

Any ideas or suggestions?

my receiver doesnt support DTS but it supports dolby digital 5.1. I may upgrade my receiver.

note: I have a small-medium room