I realy like my Mark bass 300T all tube head, with self adjusting bias, the amp can tell you if a tubes going bad and witch one it is befor you have a major issue, I run mine thru and Ampeg 6/10 with an ebs micro 2 pre amp. not a rack unit but still well worth it,
I also am very much in love with my Mesa 400+ with my fb-2. the tone is amazing, but my amp flight case is just under 150 pounds