A few weeks ago I borrowed a Adcom GFA 555 and a Hafler TA 1600 power amps from a friend. I bi-wired them to my 801's, Hafler on top and the Adcom for bass. The Hafler has adjustable outputs, so finite adjustments can be made for interesting results. The room is a whole lot cooler and it's a lot of fun tweaking. I bought a used Adcom 555 here and bridged both into mono mode. The bass is even better.
The adjustable outputs on the Hafler is a really cool feature and may be something to think about when putting a bi-amp set-up together.
Good luck
