Best Album Purchase, or Best Evaluating Record


I would just like to know what you consider your best album purchase ever, or your choice of album used to evaluate a stereo system.

My best purchase has to be about 300 - 400 classical records, for $300, that contained many mint shaded dogs, Living Presence, and blue Backs (among others).
licoricepizza
Isao Suzuki String band (featuring Ron Carter) on Flying Fish direct to Disc.
I brought it to an audio show to play on the Caliburn table. The guys from Caliburn commented on how incredible the recording was. The music is even better.
The Fone jazz LP's are awsome as well.
"Boomtown" by David and David. Bought it at my barber shop for $1 last year. Killer sonics for a pop record. Darn good music to boot.

Ok, pretty lame. But hey, what's the best record YOU ever bought from your barber???

Cheers.
For evaluation I like:
Come Away With Me- Norah Jones
Time Out- Dave Brubeck Quartet
I have the David and David record too, and it is good for a lot of reasons. The lamest purchase I ever made was a Jay Ferguson cutout, back in my college days. At least it has Thunder Island on it!

I also have the Norah Jones, and the Dave Brubeck albums. Not only is the Brubeck a mono copy, but it looks like the previous owner used it for a Frisbee in the street.
The best ablum you could use in evaluating a system is the one that best represents what you like to listen to. If it sounds good that would be an indicator that you're on the right track.