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