Where do I start-amp or speakers ?

You always want to start with the amp. Always. In fact, the pervasive view among most “experts” I know feel that the most important part of the system is the first 6 feet out from your wall. So I’d recommend a power generator like the PS Audio P5 or P10 along with solid power cables connecting that to your outlet and source components with quality power cables connected to your P5 or P10. 

The fundamental truism pronounced over 30 years ago by Linn Sondek is still classic: “Garbage in, garbage out.”  No loudspeaker in the world can “fix” the noise that comes in from your power provider, and if your amp is cranking out dirty power any quality loudspeaker will simply deliver that signal as served up by your amp and preamp. 

^A specious argument. Sources can't fix what is contaminated by the speakers. It matters not if the contamination is at the beginning, end, or in between.  Speakers are the most colored link in the chain, and furthermore, the link most compromised by what's around it.

If you don't like your speakers then where will you be?

My room is a typical 80’s “vaulted ceiling “ room. 10 feet at speakers’ wall, 20 ft vaulted to the rear ceiling wall, 18’ length of room. 16 wide. Wide doorway open to DR.
I think Maggies would be too tall, but maybe not. I’d like to try them, but then here we go again with the monster amp arms race. 
Great posting guys. Thanks much. 

My room is a typical 80’s “vaulted ceiling “ room. 10 feet at speakers’ wall, 20 ft vaulted to the rear ceiling wall, 18’ length of room. 16 wide. Wide doorway open to DR.
I think Maggies would be too tall, but maybe not. I’d like to try them, but then here we go again with the monster amp arms race. 
Great posting guys. Thanks much. Maybe I should just start with a nice rack...