Good luck on that search, Mike. Fran bought a Discover 5m module this past winter and I have one of the few e60's I know of. We both own(ed) G70, e60 and DisCover5 boards. A DC5 would probably be the least expensive way to get what you want, but the e50-60 line will do the trick too.
Ask Fran if he still has or wants to sell the DC5m. It's a great piece of equipment and can be easily MIDIed to any keyboard.
Don't discount the other manufacturers. I'm pretty sure the mark/jump/loop features are getting very popular on other arrangers too.