Eminent Technology 8b Speakers - Amp/wattage Recommendations

I recently purchased a nearly new pair of 8bs. I am now looking for an amplifier. 

My preference is tubes over SS.

The room is 23x15x10 feet dedicated for music. 

I like to play music fairly loud at times. 

I will likely biamp, meaning whatever tube amp I end up using will receive a high-pass filtered signal and drive only the mid and high freq panel drivers. 

I am aware that Bruce T recommends 75-200 watts. 

I am considering two options, (a) Quicksilver KT monos with KT150 tubes (100 watts) and (b) another amp by a boutique builder using 4 KT 120 per side and 120 watts. 

My preference is option (a), but worry that 100 watts is not sufficient. 

I would appreciate any real-world experience on how many watts is practically needed with the 8bs. Are they as power hungry as I think they are, or is 100 watts more than enough? 

Does bi-amping make a difference, meaning one can get away with using less watts since you are driving only the mids/high drivers and not the subs? 

Any feedback or suggestions from 8b users would be appricated. 

Thanks much!