I'm an old analog fan. A Boss CE-2, or a CE-1 if you've got the scratch. Also check into "dimension" pedals like the DC-2 or DC-3 -- these produce an effect similar to chorus, with more emphasis on doubling and less on pitch bending. The Small Clone is a neat analog chorus, too.

Note, though, that these are all discontinued and only available on the second-hand market.

C.K.