Matt,

Highway 61 Revisited which also has other Dylan classics like Desolation Row, It Takes a Lot to Laugh, it Takes a Train To Cry, Just Like Tom Thumbs Blues, Ballad of a Thin Man and the title track. I'd say it's a "must have" Dylan CD. Avoid buying his greatest hits because you'll just end up buying the original albums and not listening to the greatest hits CDs. This is the voice of experience talking.