Great call on Dismemberment Plan, as I mentioned in the Of Montreal thread E6 bands are the shizzle.
I'm on a big ambient kick lately so I will throw out a few names: Explosions in the Sky, Mogwai, Sigur Rios, Bell Orchestre (Arcade Fire sister band), and my favorite:
Godspeed You Black Emperor. Amazing orchestral rock that gives me the chills everytime I listen to it.
Moya