Bryston 4BSST, or 7BST's w/B&W M802SIII's?

I have a pair of B&W M802SIII's that I've been thru a few amps with; slowly learning that they like a lot of SS power. My latest is a C-J MF2250 (125 wpc) that is a very sweet little amp, & my best result so far with the M802's. However, the system still sounds a bit congested on orchestral or big band music played at "realistic volume levels". One amp I'm considering is a C-J MF2500. But I've always wanted to try a Bryston, & have narrowed it down to a 4BSST, or 7BST's; with the 7BST's going for a few hundred $$ more used than the 4BSST. And to be honest, I haven't really thought thru the dues or expense of the extra cables with mono-blocs, but I tend not to spend big bucks for cables anyway. And it might come down to "opportunity", as well.

My listening room right now is only 12' by 16'. Rest of my system: C-J PFR pre-amp, Cary 303-200 CDP, Fanfare tuner, Rega P25 w/Benz Glider. Thanks in advance for any advice!