Good new, current, catchy songs?

I just got a $100 Itunes giftcard and want to get some good new songs/albums! I have all by LADY GAGA, ADELE, THE BLACK EYED PEAS, KE$HA, JLO, NICKI MINAJ, P!NK, and TAIO CRUZ. I want some really catchy pop songs. I would like current songs, but if there are some older songs/albums that are really great and catchy, I'm in! Thanks so much! I greatly appreciate it!