1st speaker considerations: Odyssey Lorelei, Meadowlark Shearwater, Spatial M3 Turbo S

Hi,
 I'm looking to just get started and prefer to buy used.
I listen mainly to rock and pop (Beatles, Doors, Zeppelin, Fleetwood Mac, Van Halen, The Police, Duran Duran, Nirvana, STP, just as some examples), and will have the speakers in a 16'X19' room, which has issues, I'm sure, such as an opening on one side of the shorter wall into a 5' long foyer. There's also a staircase partially in front of the back wall. I'm open to using room treatment. I can cover walls if necessary, etc..
My hunch is that I'd prefer a slightly laid back sound to aggressive and forward, which might be fatiguing for me. I'd also prefer speakers that retain a good amount of detail at lower volumes.
Have any of you heard the Meadowlark and Odyssey speakers, and can compare the two?
I'd also consider Odyssey's Kismet Reference speakers.... Thanks for any thoughts.