I think it all depends on what you are into. I can hit a club like SF on night but then want to listen to hip-hop the following week so I would hit chaos, or NV. Wanna hang out with some model chicks, hit up Eugenies, China, suite 16, lotus. Wanna go to a lounge hit up justines for the hip-hop environment or slate or the Russian Tea room. If its for just a good damm party and a wild night SF would be the one with pre party at world.
SF is definitely a good club...after hours is when the music is pumping. Exit is alright too although i haven't been there yet since its been renovated. Cheetah was good - i was there on a Thursday nite
if your fucked up,,most of them are good, Factory is good,,,exit used to be ok havent been there after the Earth thing, centro fly is ok if u like the trendy type of thing...again like yellowbottle said, it depends on what your into