I would second Brian's advice. The Halcro and Boulder electronics, in my auditions of them, are excellent but neutral almost to a fault, if that's possible--they reveal so much detail that I wind up hearing more of the recording and the upstream equipment than the music, and that's not the balancing act I want. The Lamm electronics are also pretty close to neutral, but have a slightly dark sound in comparison (neutral but probably a little rolled off in the highs), which I like, and they let the music through beautifully. Have not heard the Tenor, only good things about it. If you go with the Lamm amps, I'd strongly urge using the L2 preamp with them, a great piece of equipment and an excellent match for their amps. My Lamms work very well with NBS cables (Omega 0), by the way, if that's a concern.