What about
The Middle or
Sweetness by Jimmy Eat World? Or, lol, Shawna mentioned this on a thread a while ago, and I immediately got hooked on it:
Bulletproof by La Roux. Hmm, and I see you like Matchbox Twenty
Their entire first album rocks... Not sure what else to suggest, I listen to mostly alternative/rock, but these are good songs to sing along to.