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
Thank you all for your input! I eventually got the Bottlehead Kaiju into my system do drive the mains and even with only 8watt/channel it got plenty loud and still crystal clear for music. Unfortunately, even after tinkering with the levels on the Anthem, it still didn't have the right dynamics for movies. So right now I've got it running through Zone 2 on the Anthem for music only, and movies are still through SS. 
I have not, I was assuming (maybe incorrectly...) that the combination of tube pre and SS amp - as was previously suggested - would be superior. What would be the pros and cons of a hybrid? 
I have a Rogue RP-5 tube pre with a SS Nuforce amp. I like the combination. However, from what I've read, The Rogue pre does not sound like a Tube pre in the traditional sense. Much more modern sounding. I do say that the mids and highs seem much more silky (with stock JJ tubes) than the previous Peachtree Nova Pre. 
Butler Audio makes a 5 channel hybrid tube input solid state output amp  $3k