Can I please get some opinions on this issue. How big a part does it play in your tone? Im most likely going to buy a GK 1001rbII head, 700 at 4 ohm. Th other amp Im considering is a Genz Benz, 420 at 4 ohm, 600 at 2. Now the guy working trying to sell me the GK is saying its headroom will be way beta then GB, but how much will this effect me? If I can get enough volume out of either one (and I need a loud amp which both are from what Ive heard) then how much of a big deal is the headroom? thanks heaps Id appreciate any input. BTW as I understand it headroom is the difference between what the amp is putting out and what it can put out, ?