Do a search on Eico here and on AudioAsylum and you may come up with some more suggestions as well as those here. I seem to recall those EL84-based amps being a pretty good match for vintage Quad ESL57s which would be just over your budget and also a bit large. The sloped ceiling behind the speakers may actually work in your favor, but it's hard to say. I'd still keep the Cornwall's in the running to. No experience with your KEF's.
Marco
Marco