yep... the pic said something else to me... 4ft? That's a deal breaker for me.
I agree too that big amps make a world of difference if for no other reason than the control they exude on the drivers. Until I got into tubes recently, I felt the deal was 86-88db speakers with five or six hundred watt amp (s). Definitely nothing under 250.
Then there was tubes... and uh, the 'room', 4-6 more channels, and yada yada... then back to 5.1 again.
I'd be more than curious to see how the Butler TDB 2250 fared with those Kings. the influence of tubes, but speed of SS, and there's that control factor. My TDB 5150 in 2ch mode (only the Sonatas being connected) comes close to 250wpc and sounds like it, yet outputs only a buck and a half into 8, all ch driven. So I use it as a 3 ch amp in HT for the fronts & center.
Zu has my attention now but again, the room issue surfaces as the "Presence" is interesting. Adversely, so is the Quattro wood.