picking speakers (and electronics) for a relatively large room - new

Hi guys I am purchasing my first high end 2 channel audio system for a reasonably large room in my house and would like some input. My speaker budget is approximately $13k and overall about $20k.   I will be streaming exclusively. I've done some listening and am trying to decide between Goldenear (Triton One and Reference), Sonus Faber (Olympica III and Serafino) and Focal (Kanta 3 and Sopra 2 - haven't heard yet but about to listen). I listen to a lot of electronic music, somewhat loud, in addition to having been raised on jazz, standards and vocals which I will return to often in smaller quantities. I mostly listen around my living area rather than in a dedicated listening position, but I appreciate my music.

I think my first issue is the size of my space which is 15x25 with a 12 foot ceiling on half and a great room cathedral ceiling on the other half. Also the room opens to another room with a lower 8 foot ceiling and has two french doors that in nice weather open to the outside - so, a rather imperfect and large space.   I am trying to figure out what will fill the room appropriately in terms of speaker and then power.  

 My questions are:

1. are those Sonus speakers physically too small for my space and do I need physically larger speakers than those (note: I realize they require more power but take that out of the equation for this specific question assuming I can spend more to supply them with what they need)?
2. the Focal Sopra 2 is physically smaller but from the higher product line and more money than the larger Focal Kanta 3 - should I go with the higher end but slightly smaller speaker (46"H and 7" largest drivers vs 50" H and 8" largest drivers for comparison) or is it physically too small?
3. how much power do I need and how does a guy in my position determine this? (I already know the sonus require more power but what I am asking is once I pick a given speaker how do I determine how much absolute power do I need? do I take gear home and keep trying (seems impractical)? how do I decide between 100, 200, 300, 500 or more(?) wPC?   is it like hard drive space where more is just better up to a certain limit so spend as much as I can? (seems irresponsible - I would like a more satisfying answer)
4. I have been thinking I would invest more dollars in solid state amplification because of the dynamic music I like and a tube preamp so that my midranges and vocals benefit from this treatment.   at my knowledge level how do I tell if a speaker and amp 'get along?' which I read about but don't know that I could really screen unless it is super obvious.   I don't trust my ears enough to really now or know how to evaluate. should I just buy some very reputable separates (I have been thinking used to save money) and string em up?

Would love any opinions about these questions specifically or generally. Cheers!