The ones that I really like are: Nickleback, Silverstein, Alterbridge, Creed. Also if you got a computer download "Pandora" it's a Internet Radio Station that plays the music you want. You can put for example Creed and Pandora will play music from them and bands that play that kind of music. Hope this is of help.
This is a list of alternative rock artists which includes artists who have either been very important to the genre or have had a substantial amount of publicity. Some of Good Alternative Bands are Jack's Mannequin, The Afters, Jason Reeves and acceptance.