3 part question and looking for advice! Home theatre setup and going to go with either the SB-2 or SB-3 for front speakers and either RB-3 or RS-3II for surround. Anyway, local dealer suggested that I upgrade to the center channel RC-3II regardless of which one I go with.? Also, new house so is 12# gauge speaker wire sufficient on 50 foot runs with a Denone AVR3802? One last one, he recommended the Definitive Technology PS100 for my sub.? Thanks for any input, advice etc!