A couple of things to consider:
You want a good metal sound, good cleans & a good crunch sound, but does that mean you
need a 3-channel amp? (i.e. do you
need to switch between the 3 sounds rather than just adjust the amp controls?) - if so, that instantly rules out the Uberschall.
IMO an EL34-driven amp does the "open crunch" sound better than a 6L6-driven one (yes, I know, sweeping generalisation :)), but I've found the Engls I've tried cover it well enough (see my comments in another thread about Savage vs HK Triamp)
Powerball's metal sound is very, very good, I liked it too (though I went for the Savage). How loud were you able to demo it? & with what speakers? If it sounded good to
YOU at the volumes you want & with the speakers you're likely to buy, then why take any notice of what you heard?
Others to consider, given your comments about Mesa/Peavey:
Hughes & Kettner Triamp MKII - absolutely sensational clean & crunch sounds. I liked the high gain too - as much
gain as anyone could want, but the Savage was just more
"MEEEETTTTTTAAAAALLLLLL!!" :twisted:
Engl Savage (need I say more? :))