Switching from solid state to tubes


Hello all, 

I am looking for advice regarding the purchase of a new (to me, not brand new) amplifier. I currently run a 5.1 home theater system with Sonus Faber Olympica IIs as my mains, Olympica Is as my surround, and an Emotiva center channel and SW. They are now being fed by an Emotiva XPA 5 that receives its signal from an Anthem AVM60 processor. I currently use the system 75% of the time for stereo music and the rest for 5.1 movies. And when it comes to music I do 50/50 records and streaming. 

I recently put together a Bottlehead amp and am really loving the tube sound and would look to bring that into my main system. But here are my questions going forward:
1) Would it be silly to bring in a tube amp to drive the mains and keep the rest of the system through the Emotiva SS?
2) If not, what power output should I be seeking for the stereo amp? (The Emotiva is currently rated @200 watts (8ohm)) 
3) Will the Anthem processor be able to properly match the output of the different amplifiers so the volume is nice and even across all channels? 
4) Do you have any suggestion for an entry level tube amp that matches the Olympicas well? 

Thanks!

-Al 

allforwill
Butler Audio makes a 5 channel hybrid tube input solid state output amp  $3k
Sonus Faber Olympica II

There are no impedance /phase graphs done on these yet. But Sonus Faber rates them at 4ohm nominal, which means they could even dip down to 2ohms. It seems they need an amp with a bit of current judging by this  Sonus Faber statement in the HiFi Choice review.   

HiFi Choice:
Sonus Faber Quoted "Suggested amplifier power is 50W to 250W with a nominal impedance of 4ohms a good, strong solid-state amplifier is needed." 

Cheers George