I love The Big Laboweski "We are Nihilists we believe in nothing!" Definitely a modern classic.
As for Walk Hard, I thought it was going to be really dumb just like Telledega Nights, but it wasn't. I mean, there are some parts that are dumb, but overall it's actually pretty smart and there are some friggin HILARIOUS parts to it. It's not like you need a theater experience to appreciate the movie, so waiting for DVD or downloading it would be fine.