I'm not going to recommend a speaker,however,because of your placement,you need to only look at something with a sealed box,or front porting. Rear porting will not sound optimal with your placement.
I think the Rega R1 suggested by akg is one good fit given your amp and room constraints. Sensitivity of 90dB, nominal 8ohm impedance, and need not require placement far from back wall. Maybe you could find a used pair, thus saving money for the TT.
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