Oh, you have one that you like already? Unless you're a little obsessive, there may or may not be a reason to get the long dash, then. I think the long dash sounds warmer / better, but that's just me.
I can't hear any difference between my 3 CE-2s. The oldest is a long dash/silver screw while the newest is from 1986. The only thing that I know has changed internally is the brand of capacitors. Othewise I think they're all the same.