Try here, but be careful because some of the songs have cussing and others are pretty racy: (Just look up the titles and lyrics so you know what the flavor of the song is. You can also listen to samples.)
I am pretty sure that the Jonas brothers, Miley Cyrus, Stacie Orrico, and One Republic are all ok. I have those, although it's been a while since I listened to them.
Have you considered traditional band dances? If you don't have a pep band you can get some pretty good songs online. PM me and I can tell you where to buy them and which ones are good.
Diamond guide-Diamond buying guide