Thanks guys, this has been really helpful. I think I'm going to wait and try to score some more highly efficient speakers off the used market and experiment.
The Decware amp is something special and with such a potentially long wait to replace it... It would hurt bad to sell it and then have to purchase the Zen Mystery Amp and get it 15 months later.
I have my Denon SS, old trusty, which is class A and does fine, with reduced sound stage, But OK for metal.
Hard to beat Ben Webster blowing dirty on his reeds over the Decware, it's just that at the highest volume, it is pleasant, but sometimes you just want that little bit more...
Best and thanks again,
Steve