any audiophile guitarists out there?

Good eye Kijanki... I own a Rowland model 8 and a Roland Microcube, amazingly
I think that the Roland might be the louder of the two..:0)

VOX makes the "Nightrain" head which has a triode mode and a pentode mode - basically cuts the power output from 15 to 7 watts. Sounds a little different in the triode mode, but sounds like a VOX amp either way. You mentioned power. If you aren't gigging you don't want a lot of power. The issue of power in a guitar amp is really the headroom - the point until you start to berak up. Of course there is really no point in having a tube amp unless you want the amp to break up (drive the tube into distortion). All tube amps will be loud. Tube amps also have very distinctive flavors - which makes sense since you are trying to distort the signal. A lot of people mentioned Mesa Boogie - fantastic amps. But you get a different sound from VOX, Fender, Marshall. There are also some nice boutique amps out there. You really need to listen to guitar amps to find what you like. A lot more variation between manufacturer's than what you find in audiophile equipment. The differences are far from subtle. I personally use a low wattage VOX for home practice.

My brother owns a THD UniValve amp which has a clean and neutral quality.

here is a blurb from their website: The THD UniValve is a Single-Ended Class A amplifier head with a single output tube that can be switched at will among many octal-based power tubes...

Daveyf - Before I realize I have no talent for music I bought 30W VOX Valvetronic. It uses DSP processing to mimic sound of different cabinets but also effects. Non-distorted effects are pretty good but distorted are horrible. At the time I considered Roland Cube.

Kijanki, One of my modellers is a Vox Tonelab. It has the ability to model various amps, pedals, cabinets etc. I used to own a Line6 Pod v2, which IMHO is very limited and sounds much worse than the Tonelab. However, I have never used a modeller that really comes that close to the real thing.. i.e.,A Fender Tweed from the 50's has a tone that is to die for, the modeller's repro of this amp is really a joke when you do an AB.
I think if I were to get another amp, my #1 choice would be a Princeton or Deluxe Tweed folowed by a Black Face Super Reverb. All are amps that sound truly magnificent, IMHO.