Best amp choice for Thiel 2.4

Thanks for your suggestions
Pratically the best choice is to remain in the Pass family and to buy a X350.5

Has anyone matched the Thiel 2.4 with Channel islands D-200 ?

BAT VK-600 has the juice and musical ability to make you very happy.

All excellent suggestions- it is going to me a matter of personal taste.
Classe' Ayre, Mark Levinson, Pass Labs...etc., all make outstanding solid state power amps. Krell is going to provide high current, important to know, when considering any Thiel speaker. Happy Listening!

Knowing most the manufactures on your list - meaning I have experience listening to them, except the Ayre I'd lean to the Pass X250.5. My Aerial are probably no harder to drive than your Thiel's and I use a X250. The X250 will have plenty of juice unless you're playing crazy levels which eventually you'll cook your ears and it might not matter later. I wouldn't consider a 300 series ML unless you know it's been recapped and there's proof of it; hardly worth recapping these amps because of the cost doing being so high. With a X1 I'm not sure you're going to hear as much of a difference between an X250 or X350 vs the .5 series but you might. If you had a X10 or up I'd say for sure the .5 series. The .5 series is definitely better, but that being said you might look at a X350 if you really need the power over a X250.5 if you're watching the budget. Before I would spend the difference I'd maybe upgrade to the X10 as well... just a thought. The X1 is a nice preamp so don't get me wrong... just saying if you're leaning towards a pass don't rule out a X250 or X350 and don't sweat the .5 series because the older models are still very good amps. Best of luck.