Bryston monoblocks 7B ST replacement


Hi guys,
after 15 years of using these 7B ST monoblocks I recently started thinking about trying to use different monos.
Not interested in stereo amp, just monos again. From your experience, what monos would be significant upgrade?
Thinking about SS again, now using Vienna Acoustics Beethoven 4 Ohms towers. My budget is $4000USD for used pair. Any suggestion from previous 7B ST users is greatly appreciated.
rohlim
Belles Aria Monoblocks? $3K new
or
Ayre MX-R's, unfortunately more than $4K used, but would be my pick.
B
Thanks gdnrbob,
what have you found better in recommended Belles? Can you be more specific?