I'm looking at alternatives to the Sturmey Archer CS-RK3 and found the Shimano Nexus Inter 3. Problem is that this unit nor any of the other internal gear hubs in the Nexus lineup have the ability to include a cassette. I just got off the phone with one of their reps and they unfortunately were able to confirm that. Too bad. Looks like Sturmey Archer's the only company that allows an internal gear hub to be mixed in with a cassette. Brilliant.