I had the Vox AD120VTH. It was very easy to use, and had some great hard rock sounds. Very tube-sounding, but not what I would consider a metal amp. I haven't owned the HD147, but have tried 'em out (and do own an XT Live with the Metal Pack, which has, I believe, the same sounds). It's much more metal-oriented, but not as tube-esque (new word just created).
Looking at your needs (one great sound, no need for stereo effects, etc.), I'd have to agree with adamcbest. It sounds like you'd be happier with a tube amp.