I was just tuning into one of Avicii's live sets and found that he has a bunch of really sick, heavy, catchy songs that he puts in there. I found this song particulary sick: http://www.youtube.com/watch?v=P5rNfSe2Cr8 Go to 2:15ish and wait for the drop so you know what I'm talking about.
But anyways, please help me find more songs like that that arent too crazy, but super heavy and can really get a crowd going. Thanks boys and girls.