My home is currently set up as two seperate media closets, one for upstairs and one for downstairs. Because of this configuration I assume I will need two seperate receivers. Upstairs will have three seperate zones to run and downstairs will have two seperate zones to run. Will I need two seperate receivers or can anyone suggest something more cost effective. I currrently own two receivers Denon AVR 2307 and a Sony STR DE885.