I'd use one of these:

http://www.sturmey-archer.com/hubs_3spd_SRC3.php

If you give up the idea of a coaster brake, you can get one of these from aebike for $53 Like I did.

http://www.sturmey-archer.com/hubs_3spd_SRF3.php

They have aluminum shells with thicker flanges than the old ones and they don't leak oil. I really appreciate the fact that they've eliminated the neutral between 2nd and 3rd.

They're good looking hubs once you take the logos off:

http://good-times.webshots.com/photo...68014369DFdAOD