The SVT-4 has the juice I need but the SVP has that cool tube gain knob and 5 tubes as opposed to the SVT-4's meager 3 tube compliment. My question is this; What synergy happens with an "all-in-one" as opposed to a rack setup? The SVT-4 is tidy and neat, the rack system a wee more "fussy"...not that this matters really. The SVT-3 is underpowered from what I hear and doesn't have the flexibility a rack or SVT-4 would offer so that's not an option. Any help you folks could offer would much appreciated, thanks.