[WanderingMinstrel]

Check here: Epic 4G Android Development - xda-developers
Several EL30 options are on the menu. Most don't have modems so you'll have to flash or odin that (there are threads for both there). Also many don't require that you unroot.

I'm about to move to the Sleeper after reading most of the threads. There was supposed to be an update (announced last week) but it hasn't arrived yet. People seem genuinely happy with it.