Thanks for responding, Nigel.
On Ebay the Mirage recently sold for $180 and the Peavey KB 100 a little over $200.
I bought a used 76 key digital piano with MIDI, which is all I really need to play, compose, and control my MIDI stuff. I've never really gotten into the sampling, so on me, it's kinda wasted.
I'd be happy to get about $400 for both to help defray the cost of my "new" keyboard.