The Maxon CS-9 has a great sound that can be subtle or deep. It sounds great with fretted or fretless. The only reason that I am trying to trade mine away is because I miss the sound of the Analogman Bi-Chorus that I used to own. I wouldn't say that the Analogman is better than any other chorus, but it's definitely a sound that I like.
I'd also recommend the Fromel Seraph, which is a BOSS DC-2 clone. It's definitely a shimmer-y 3d kind of chorus sound. Also, a slightly detuned sound like that from the POG, PitchFactor, and IIRC PS-3/PS-5 have on them.