Of the amps you list, I'd go with the Plinius. I own and sell electrostats, and in my experience the Aragon is a rather steely-sounding amp when mated with electrostats - I really don't think that would be a good choice. You want something a touch on the warm side if anything, and of the amps you list, that would be the Plinius.
I sell the InnerSound amp, mentioned by a couple of people here, and it can probably drive any electrostat on the planet. Clayton Audio amps are also quite nice. I generally recommend tubes for electrostats, but Clayton and InnerSound are exceptions to that rule, and sound better than some very well respected tube amps I have owned.