Building new system starting with power amp. What would you choose ?


This is not how it usually happens, but what if you simply must have a particular amp and then move with upgrades in both directions? Let's assume that the only source will be RTR deck, so no preamp will be needed.
The price range..how about $15k new or used ?
This is a hypothetical exercise, I am personally not prepared for that yet. However, it would be, theoretically, perfect minimalist audiophile set-up. 
I myself would probably choose either Lamm monoblocks or Gryphon stereo power amp, both used of course.
inna
Because just starting out you have no idea what you really like. It will prob take years to grow, learn as evolve as you better understand what you like and what products offer what. 
Amp- I would start my buying used because if you don’t like you can resell for close to what you paid as you learn. Stick with top notch brands that hold their value. 

I agree with 'unsound'.....you've got it backwards. Choose the speakers that fit your taste and then find amplification that is compatible with the speakers
I just built a new system a little over a year ago. I went with a mcintosh mc462 and am very happy with it.