Having gone through many, many amps
My 3 are
.fender superbassman
.my old US Ampeg Cl
.my main Amp now (can't handle the above weight no more) Warwick tube path 1000... The closest I've found to sound like a big tube amp that isn't, I bloody love it and can't see me changing. Even though it's not the most sexy looking
As far as micro amps go , the Mark bass TTE heads ... If it had a better EQ they would be incredible, such a big valve amp feel