I like to use alice n chains unplugged. Just the whole cd really, it's pretty good.
Also, intros that I like to use are these:
Thursday - Autobiography of a nation
Coheed and Cambria - Second stage turbine blade
Tool - Crawl Away (probably one of the greatest intros I've heard for all instruments coming in at once, just the power and energy is amazing)
Rage Against the machine - Matrix theme. I know that's not the name of the song but thats what my winamp calls it. Anyways, gives a goodworkout on the mids.
as far as songs go, of course the live performance of Hotel California is a given. Most of the time I Just play intros though, not full songs.
edit: oh almost forgot, Dave Matthews, Tim Reynolds - Grey street live. Love this version. (seeing them in dallas next weekend btw ;P)