I am looking for some advice.

I have pretty much a 5.1 solution right now that sounds really good. LFR1100 + VP180 for the front, and QS8 for the side. I have some rather small Energy Take5 speakers that I have fitted on the back but to be quite honest, I can't really decide if they are adding anything to the sound mix.

I was thinking of getting a nice set of the new M1 computer speakers and was thinking of perhaps putting in a better set of speakers for the rear channel. Perhaps a set of M2 or M3's

Anthem: AVM60
Axiom: ADA1000, LFR1100, VP180, QS8, EP500, M3, M3comp
AudioSource: Amp One/A