Doug,
I owned the AVD 50 (a little less power, and only had a one disc loading trey). The detail and total control it had over the cones was incredible. As I grew more accustom to its sound, I noticed that I just wasnt tapping my foot and keeping interest in the music. It was just dry and sterile. While I appreciated all the fine naunces, control, and details it brought to the table, I just found it to be musically deadening.
I find myself now, exactly a year later, using the JVC RX-F10. This piece is a pretty sharp contrast from the Sony unit. It wont have every last ounce of detail and control, but it will give you an incredibly beautiful presentation that definately gets your foot tapping to the music. This unit, from what I have heard, does not suffer from the sterile nature most affordable products that sport chip amps do.
Also, I would not discount tubes. The Jolida JD-1301 hybrid integrated amplifier (tube pre out stage, dual 12AX7's) had PLENTY of bass. It was deep, detailed, and had remarkable impact. This was no doubt thanks to the decent mosfet amplifiers on board the unit. You got the blend of both worlds, that great tube warmth with the solid state impact. Detail was not sacrificed much at all. It is limited in power however, and only meant for stereo use, so your satisfaction will largely depend on the demand your speakers put on the amplifier, and the application you would use it for.
Good luck on the hunt, I am sure you will get many suggestions.