okay, here we go again...

You'll need serious driving (current, etc) abilities for the speakers; three products that come to mind are Symphonic Line rg10 (i heard this recently), YBA Passion integre, MAYBE the Pathos integrated (tube hybrid).I liked the sonic qualities of all three. (Doesn't Innersound offer an integrated?)
I've heard them drive difficult loads but NOT the Isis, so please check them out if interested. Cheers

I have Acoustat electrostats in my second system , a notoriously tough load for amplifiers. I have been using a Musicial Fidelity A300 Intergrated for over a year with no problems at all. It seems to control the Acoustats with no loss of dynamics or bass response. Good luck.

Iasi- Have you considered the option of getting a CD player with volume control and running it direct to the amplfier? Though I prefer having a great pre-amp in my system, this approach might work well for you and allow the consideration of a Cary V12 amplfier. It's just an idea. Good luck.