From what you described, it sounds like you're looking more for a nightclub type of vibe than a dive bar/watering hole, and there really aren't a whole lot of great options imo. Honestly, just wander around the Castro and pop your head in to different places to see if it's your type of scene. It really depends on what you're into (bears, twinks, latinos, asians, etc) and what type of scene you're looking for (night club, sex club, happy hour, neighborhood bar, dive bar, etc).