I really like the MXR Stereo Chorus M-134 (analog). Lush, versatile, plenty of options, adaptor included or two 9 volts. Can do Andy Summers to Alex Lifeson tones. Zakk Wylde uses it, and I think I saw Petrucci using it in a recent rig photo. Guitar Player gave it an Editor's Pick Award.
I have been using a Visual Sound H2O and an very happy with it. Quite adjustable, not "over-the-top" chorus - and the dual pedal includes a very good echo unit as well!
Analog.Man Bi-Chorus with deep switch and stereo outs. I use one channel on it for standard chorus (w/ Deep engaged) and the other for a Leslie effect. I've used it on both my bass and guitar.