Help me with this choice Paradigm, JM Lab, Sonus

I own JM Labs speakers, though I have never been a fan of the Electra 906 specifically. I am not at all surprised you preferred the Paradigms. The signature series stuff I have heard has been impressive. If it weren't for the (in the case of the Signature's at least) unjustified "mid-fi" rep Paradigm has, I think these would have a lot more buzz surrounding them (recent Stereophile cover notwithstanding).

Although, if you are willing to buy used, you have so many options. My first thought, since you are looking at monitors, is to stretch your budget and look for a good deal on Cremona Auditors. I have seen these not uncommonly for $2900 or less (with stands, which you WILL need). These will put you an entirely different class than the other speakers you mention. In the right room and with a good sub (specifically, a REL) they can easily hold their own against the $9000 plus Cremonas, at least in my opinion.

"I much prefer the JM Labs over both the speakers you mentioned. I think Sonus Faber does very well with classical, vocal and jazz music but I doubt you'd find them as acceptable for rock."

Interesting how perceptions vary. I own Electra 926's, and there is no question but that the Cremona Auditors and Cremonas rock better (to my ear), and certainly WAY better then the JM Labs monitors I have heard (906, mini utopia, micro utopia).

I believe the big question between the two is how you personally are struck by the voicing of the two speaker lines, which in both cases is distinctive and not truly neutral (at least not in the way you would find in a British monitor/full range speaker from the likes of PMC, AVI, or ATC). The Sonus line tends to have a lush character to the sound, where as JM Labs seem to me to have a characteristic clarity and a somewhat bright emphasis deriving from the famous tweeter. As a friend of mine says, speakers are like ice cream – everyone has their favorite flavor. You just need to decide which flavor is for you.