Floor Stander or Monitor w/ 2 subs? What does the later give up in a large room?

@newbee 
It does give you a better respect for the Silverline's abilities. 

Being a designer and manufacturer of both floor standers and monitors I can comfortably say, assuming equal quality, that the total output (SPL) is what is the biggest compromise. Driving some monitor speakers to higher volumes will push them to higher distortion levels and dynamic peaks can be truncated. Adding subwoofers won't fix that. Much of what makes a system sound dynamic is happening in the midrange. In our monitors we use one high out AMT (designed and built in house) and four 6 inch woofers to achieve good total output. In our 7000 cf (approximate) evaluation room our monitors produce good SPLs but nothing like our towers. At low to reasonably loud levels they both sound great (to us). You can guess which sounds better when really pushed. 

This is my long winded way of saying build a dedicated room, if you can, and keep your floor standers.

Good monitors are a wonderful thing. Just make sure you understand them.

@arion
Good info which enforces my thoughts. However the idea of stressing the monitors is something I hadn't thought about. And that stress will show up sooner or later. Yes, new room....I hope. although I was a builder/carpenter, I am 69 yrs old and don't have the stamina I once had. Hopefully my framing sub is still in business. But he isn't that far behind me in age either. But the room will be needed when my wife retires in a few years. Gotta have somewhere to hide. :-)