Hey Mac48025,
I strongly advise you to hear a SET 2A3 based amplifier in your system before you purchase a pair of SET 300b's. I have in-house two pairs of wonderful SET 300B mono-blocks and still found the SET 2A3 amplifier much more musical and natural sounding then the 300b amps. If you want you can borrow the Opera 2A3 amp from me to run the experiment in your system. Just let me know.
I strongly advise you to hear a SET 2A3 based amplifier in your system before you purchase a pair of SET 300b's. I have in-house two pairs of wonderful SET 300B mono-blocks and still found the SET 2A3 amplifier much more musical and natural sounding then the 300b amps. If you want you can borrow the Opera 2A3 amp from me to run the experiment in your system. Just let me know.