I hear that Pink Triangle is back in business!
Hope this helps.
(FWIW, I've never thought class D amps were a particularly good audio engineering development, and I would imagine they sound absolutely dreadful with ribbons. I am happy with my 350 and ribbons/planars, so I would imagine the larger Ultra would be good for you. I find Frank's hybrids to be somewhat refined, so if you're mainly going to listen to rock, etc. a larger insight might be better.)