Getting ready to start my whole house (all 900ish sq ft of it) microphone setup.  I will be using a polycom vortex ef2280 as the mixer.  I think I will be using a Crown Audio PZM-11 Pressure Zone Microphone as a starter (if i win the bid on ebay  ).   
I am curious if anyone is doing something similar and if you can share setup and thoughts.

http://voxcommando.com/forum/index.php?topic=1425.msg12382#msg12382

of course, i didn't search for vortex