Suggestions based on the EL34 tube. I have not heard the VTL amps. The Manley's I've heard many times and I like the 250's which as I recall are tetrode/triode. I've had two amps so far that have switchable triode operation and both sucked in triode. The Snappers I believe are ultralinear.
The pure triode amp I have now, a BAT VK55 sounds incredible. The downsides are heat from hell (unusable in the AZ summer) and hard on expensive output tubes. I have no room for mono's and two VK55's should heat the whole room in dead of winter.