If you don't listen to very loud level, anything with >80 dB will work as long as impedance is relatively flat. So just pick the speakers that you like and make sure it's a flat 4 or 8 Ohms speakers. So the choice is actually quite numerous.
ProAc 1SC, Reference 3A Dulcet, Harbeth, Spendor and etc. Probably smart to stay away from speakers with Dynaudio based driver. Usually too difficult to drive for SET.
For the "magic" vocal reproduction combo, 300B and BBC LS 3/5 speakers is the one to go for. I heard a pair of Cary 300B monoblock with Roger 3/5. Definitely syrupy sweet. Won't be very loud at 82-84 dB efficency though.