We like similar speakers. I thought the Nola Metro Gold powered by a VAC 160i was the best sound at the Brooklyn show, but the Nola's got a decidedly lukewarm review in Stereophile in both listening and measurements. They retail at $33,000, which is beyond what I would spend, and I'm not quite sure if they were impressive or "right."
That really makes a home or dealer test of the JansZen Za2.1 my path. Although I like my tube amp, I'm intrigued to try the combination of the Benchmark DAC2 HGC going into the new powered version of the Za2.1a. There's a trickle of good feedback appearing on the powered version.
If the combo is not great, they can be returned, but I have high hopes from spending a lot of time reading about the products, and being impressed with everything I've heard David Janszen say. Plus, I still remember how good Simon and Garfunkel sounded on his father's version of the speaker, (although that one had a dip in lower midrange.)