Need some new rock music for my ipod?

I have been searching for weeks to find some unique original rock music. I like Heavy guitars but I dont like screaming vocals. Some band I like as an example are Rage Against The Machine, System Of a Down, Tool, KoRn, Some disturbed (some of their music sounds like 80's big hair metal). I just want something good, alot of bands today are really bland and sound the same or they are screaming and not singing. Seems there isnt any good hard metal or rock with some actual singing that doesnt sound like 1980's metal. PLEASE SOMEONE HELP ME FILL MY IPOD WITH SOME NEW ORIGINAL MUSIC...im tired of all my cd's and just want a new music and some bands I can get into. THANK YOU IN ADVANCE