Skillet (awesome)
Casting Crowns
Jon Foreman (guy from Switchfoot doing solo stuff - great if you like mello stuff)
Shane and Shane
Leeland (amazing stuff, not that well-known)
Needtobreathe
Relient K (but I get tired of their style after a while)
Phil Wickham
You can find a lot of great bands by using Pandora. Just put in a couple of those on a station and it will play a bunch of music, and you can use that to decide what you like/ don't like.