Its not that I don't like any modulating, swirly whirly pedals, but I'll always go with a Uni Vibe style pedal, flanger, or a phase shifter before a chorus. and to tell the truth my fave effect of this type is good old fashion amp tremolo. I have a Japanese Boss CE-2, and as far as chorus goes it sounds as good as any to my ears, but still doesn't really grab me.
http://bandmix.ca/dajax
http://bandmix.ca/dajax