Good club music for a party?

Got my 18th birthday party coming up, and need suggestiongs to expand my collection of good disco/club music for the playlist. I want a good playlist of club tunes (such as Flo-Rida's Low, Kesha's Tik Tok or Darude's Sandstorm) - songs which have a good beat to dance to. If it's an unknown gem, all the better!