Oh, man...I wouldn't know where to begin.
I'm an ex-speaker pimp, so I have all kinds of favorites, depending on the genre and what aspect of a great mix I'm looking for...
Here are a few mixes that have never let me down on just about any system:
Frozen - Madonna
Goodness Gracious - Kevin Gilbert
Flight of the Cosmic Bumble Bee - Bela Fleck
Hella Good - No Doubt
Wherever You May Be - Bonnie Raitt
No Easy Way To Say Goodbye - Seal