If I you are considering vertical biamping, have you considered tubes on top and SS on the bottom? My friend's doing that with his Maggie 20.1's and the results are remarkable. It's a best of both worlds scenario in his case. YMMV - I'm not familiar with your speakers. I agree with Sugarbrie after taking a look at your existing system (and assuming your budget is reflected in that gear) - why limit yourself? You can deal with the different outputs of two different amps by using a variable crossover like a Marchand.
Marco
Marco