Any music suggestions?

I just got an ipod, and I want some more music to add to it because I only have about 200 songs. I'm into rock/metal and I want some more heavy stuff but I also like some alternative... some of the bands I have already like are Stone Sour, Biffy Clyro, A day to remember, Yellowcard, Papa Roach, Linkin Park, Deaf Havana, Deftones, and things like that. If anyone knows any good bands then please let me know! Thanks in advance :)