What are some of the best clubs in Sydney?

One of my mates had her 21st at Tank and loved it, I didn't go but everyone said it was awesome (I fell pregnant the year everyone myself included turned 21-clever idea) The Gaff is always lots of fun, one of my mates DJ's there from time to time so I used to go when he was working and have a ball, only been to the Piano Room once but it was awesome, was pretty wasted though lol I'm not a huge fan of Kingscross anymore so its been a few years, my girlfriends and I used to haunt the Albion in Parra every weekend cos its close to home and plays good music, and we'd get to watch the footy too lol I went there for my 20th (in Sept-grandfinals yay lol) and we went to Crinitis for dinner it was awesome :) for a 21st but I'd go for the city, Piano Room or Tank :)