Craig,
When I listen to the ESL’s they do sound pretty darn nice with the NAD 368, 80 Watts $895 w/o media streaming card), though better with the 388.
https://nadelectronics.com/product/c-368-hybrid-digital-dac-amplifier/If you haven’t listened to Rogue Audio out of Pennsylvania, their Sphinx would drive the ESL’s very nicely (no DAC, but has headphone amp & phono preamp & can work with theater by setting volume but that’s another thread). THEIR MARKETING IS VERY VERY BASIC LOOKING BY THE WAY, so ignore that. The Cronus Magnum II (out of your price range which is $2500 absolutely blows alway the ESL’s. Even blows away the ESL 9’s, and 11’s too :)
The Sphinx is hybrid integrated, 100 WPC, at $ 1500. Also has outputs for Subs.
http://www.rogueaudio.com/PDFs/Sphinx%20v2.pdf