I own a pair of tannoy reveal active and have tried various pre amps in my home studio. Starting from Numark mixers to Alesis and Behringer console mixers and some home pre-amps. My absolute favourite is the Rotel RC-03 preamp for the tannoys. As far as your concern about balanced outs, it doesn't really matter. Just make sure to use hi quality cable. If you don't use 35 meters of cable or so, you don't really need the balanced outs.
