I like this one.
 
http://vbox7.com/play:6a24e1f9&al=2&vid=279259
 
Not so good on this stream but it's on the UK CD version of India's Acoustic Soul album from around the turn of the century and it sounds stellar whatever you put it on.

My favorite is Dark Side of the Moon. 

Cosmosquad, "Acid Test"

them crooked vultures, "them crooked vultures"


soundgarden, "King Animal"


black country communion, "Afterglow"


and one from the Vaults, 
PF DSOTM

i've also always loved the mix on Brand X's "Masques"


i actually use this album as a basis for my mixes (pre-master)

Obviously depends on the genre but, besides the classics,  I've always dug Somewhat Damaged by Nine Inch Nails, the way it builds up from that tiny 4 notes acoustic motif into that humongous wall of sound. 

The whole album in fact...

And Tool. Anything off Lateralus or, better yet, 10 000 Days.

I like a lot of Fleetwood Mac studio mixes. Mick and John play so well together.... I bet they are really easy to mix. I aways thought that the Bare Trees album was a good mix. Back before I knew anything about recording, in the 70s, I would use Bare Trees and "Low Rider" by WAR to check out a new stereo system or speakers.

Some of Jimi's studio mixes are outstanding.

Sgt. Peppers was outstanding for 4-track analog tech... Pet Sounds too.

J

The album Band On The Run .. McCartney ....... mixed by Geoff Emrick.  Mixed in 1973 but still sounds fantastic to this day, everything is panned and eq'd perfect. 

Yup, for me too it has to be Dark Side Of The Moon. Remember this was before RAM was everything too !

Favorite "live" mix: "Soul" by Seal. Big band, live audience, but crystal clear and nuanced. Produced by David Foster (who also played faux-bass using Trilogy), engineered and mixed by Jochem van der Saag (who also played keyboards and programmed drums using Addictive Drums). It's a mixture of live tracks and studio overdubs. Feels live, sounds studio.

For a by-the-book tutorial on pop mixing: "Breakaway" by Kelly Clarkson. Widely criticized for being overly bright, but the mixing is superb even if not particularly imaginative - but it is, after all, mainstream pop.

For pop-country: "Wide Open Spaces" by the Dixie Chicks. The year that record came out, the Chicks sold more records than the entire country music industry combined. That was mainly due to the catchy pop-country tunes, but the quality production didn't hurt.

For acoustic modern folk: "New Favorite" by Alison Krauss and Union Station. So clean that on good headphones, it's like being there. Jerry Douglas' dobro is especially detailed, and with a master of that caliber playing you want to hear every squeak.

XTC