Can also do it with most preamps / integrateds that have a Home Theater bypass and 12V trigger output. :)
Thanks, lalitk. It certainly sounds like Sonos is a good choice for simplicity's sake. I was hoping to come across a fairly uncomplicated setup using just my monitors, then adding a sub and center, and it is possible, but definitely not uncomplicated. Oh well, I guess that's how it goes in hi fi.
erik...looked up the Parasound preamp you mentioned. Looks very interesting, but also came across a Parasound 3 channel power amp (Halo 31), which looks interesting as well. The search continues...