I still own my Cary 300B monos and my Cary 805 monos, but the speakers I'm using at the moment (Ohm 100s) won't play nicely with either of these amps. Right now, I prefer the Ohm/ARC VT130SE combo to anything I can hang off of either Cary. So, SETs can be great, but you've got to find a suitable speaker you love.
Marty
Marty