Opinions please

I am looking at the following speakers as an upgrade to my current speakers (PSB Gold Is) and would appreciate any comments on them:

Montana EPX (used)
Dunlavy Cantata (demo)
Tyler Linbrook Sig System (new)
Dynaudio Contour 3.3 (demo)

I've heard the Dunlavy's and Contour 3.3s in other systems. I liked the 3.3s more, but I'm wondering if they are worth the additional money. I have not heard the Linbrooks or EPXs, but I have read nothing but favorable comments on them. They also cost more than the Cantatas, but again, I question whether I will get the return on my expenditure.

My room is approx 2400 cu ft. and I have an Aragon 4004 amp and an AI Mod 3A preamp.

Thanks for your help.

Woody