Thanks for all the recommendations! I finally did pick up a Fisher 400. Crossing fingers it gets here in one piece as it's being shipped. Right now I'm using a Sansui AU 9500 on the Quartet's. It sounds pretty good. I was using the Sansui on some ADS L 1090's which were also very nice speakers in their own right. I do like the live presence of the Quartet's. I'm curious what the tubes will bring. I know I'll need to go through the Fisher before I use it. I mostly listen to rock, pop, and jazz. Some of the tube amps shown look amazing. Think I may want more down the road... hahaha