Thanks for your input
I have considered the HD series but they are too expensive for me
I have the base system (not hifi) and the ms-8 so i suppose the balanced inputs aren't an issue for me. Regarding space, i will gladly give up a little space for a class A/B if it means a huge performance increase. I will have a look at zapco amps as well.
I get what you're saying about price performance. The cheapest i can get a JL XD600/6 is £360 ($580). The cheapest i can get a Soundstream Reference 4.760 is £310 (this will be ordered from america and includes all shipping and taxes).
So if the Soundstream is a better quality amp AND its cheaper (although I will have no warranty as im in the UK) then i suppose its a no brainer to get it?