The Epiphone Cassady is a long scale instrument too, fwiw. Long scale instruments do some things better and short scale instruments do some things better, so it's just a matter of personal taste. It's been my experience that the biggest differences are that the G string on a short scale will have a fatter fundamental and on a long scale the E string will have more definition/punch. That being said Curtis is a great guy and makes excellent pickups, I'm sure you'd be happy with one. I'd use one of these though: Invalid Link Removed
Fred Hammon actually used to advise against swapping the Cassady's electronics out for a Dark Star, although he did occasionally do it.
Check eBay, there have been some "project" Gibson EB-3's that have gone quite cheap the past several months.
I have a Dearmond Starfire that has been modded with a passive high pass filter, a varitone, and a master volume (along with the individual volumes and 3 way switch just like the Guilds) that will be going on the market soon.