What Speakers

Be careful about matching speakers that might be a little bass heavy.The one I had could produce some very potent bass if mated to a speaker that is in a room with a low resonance.Three totally different speakers had exaggerated bass.I talked to other people with the same problem.That amp could produce potent bass on some recordings.

That is pretty much my set up as well combined with VOnSchweikert VR4JRs.
And, my fussy ear is so satisfied with the combination that every year I come back from RMAF believing that, aside from a few notable exceptions, I find my rig more musically satisfying than most of what I hear there.

Vandersteen speakers are extremely good and a great value at every price point. Considering your electronics, you should audition the Quatros, or 5A's. Both of these speakers can be tweeked to match your room - easily done by the dealer setup.

How did you end up with an amp and no speakers? Did you audition the amp with anything? The only other possibilities are gift (nice one!) or it fell of the back of a truck!

Watch the impedance of the speakers. I have a C2300 and MC275 and the combo sounded great with my Quad 2805. But when I got Martin Logan Spires, which can dip to below 2 Ohm, the MC275 could no longer keep up and sounded rolled off in the treble and the bass was loose. A MC402 now powers the Spires.