we can only voice personal opinions....since you have the opportunity to audion the speakers mentioned, all from good manufacturers, the choice is really yours.
The height restriction you noted requires just about any speaker to lay on it's side, so you are severely limiting the choices you have available. No other shelf with better height numbers, or the use of speakers on stands, etc. ???
The B&W speakers require quite a bit of power to really shine, your older Denon may not be up to the task with these speakers. Should do fine with the PSB units. I can't comments on the Era's and Monitors - no personal experience there.