I am trying to do as much research into gear before I buy it. Anyway, I am interested in purchasing one of three Heads that are in my price range GK 1001RB-2 700/50 Watt Bi Amp Ampeg SVT 3-Pro SWR 550X Head Also, I am looking into a couple of different 410s Ampeg SVT 410 HLF (4 Ohms) Avatar B410 Kappa Pro (4 Ohms) Any advice? Best pairing ideas? Any other suggestions? Thanks.