$1300 used amp to effortlessly drive VR4JR

Downsizing my system and I need to choose a used amp that will drive my Von Schweikert VR4JR with no strain in a 22 x 15 x 10 listening room, too sometimes loud levels. I'm on a tight budget, so buying on the used market and need to stay under $1300. Under consideration is:

Musical Fidelity A300 or 3.2
Blue Circle BC24
Channel Islands D100
Unison Unico
Plinius 8200 MKII

I am somewhat aware of all of these (all w/ thier strengths & weaknesses) Pretty certain that the CI & Plinius will drive the VR4JR but not my ist choice. The MuFi if powerful enough, are amp's that I won't regret. My 1st choices are the BC24 or the Unison but am concerned they will falter at higher volumes. At this price level I rather sacrifice some detail in favor of a laid back warmer sound.

Any experience with these or any other low priced amps when matched
with the jr's?
Any comments or suggestions appreciated!
Thanks!