Get your self to an Edge dealer if you can find one! The current production Edge amplifiers are a revelation and offer real power and incredible sound.
I have sold Krell and Lamm and VTL so I have a lot of experiene. The Dartzheel is very expenisve with no real track record and is only a 100 watts.
I just received a new Edge NL 12.1. Beware the older updated units, most of them can not be brought up to new standards.
The current Edge products have rewritten my appreciation for what solid state can really do! I have allways been a tube guy, the Edge must be used carefully or it can sound unrelenting, but when paired with the right stuff the amplifier sounds closer to live music than most amplifiers tube or solid state. The only other problem is the 1,000 hour break in, really, and their lack of dealers in the US.
Once you hear an Edge there is no going back they are freakishily fast, but lack the whiteness of a Halcro or Spectral amp, then combine the bass tunefullness of a big Naim and the transaprency of a Halcro, with a slightly warmer midrange, and the immaging widith of a great tube amplifer like a VAC and you have the perfect beast!