My current favorites are Genz Benz 6.0 and especially the 12.0 because of the two mix able channels, one tube one SS. I blend them most of the time. But also something not yet mentioned. My Glockenklang Soul II head is just a great sounding SS head even though it weighs twice as much as the D class varitials it is probably one of the best sounding SS heads I've ever heard!