Best dance/elctropop music?

I love Cascada, many of Kesha's songs (mostly We are who we are, tik tok, take it off), a few of Lady Gaga (Just Dance mostly), two of Rihanna's (don't stop the music, who's that chic), etc. So I was wondering which bands/singers you could recommend me? I want to listen to this type of music: dance-pop like Cascada or electro-pop like Kesha. I like rhythmic music, but I don't like beats all that much (but I can bear them in Cascada's music).