This is a countdown of my favorite audio Snipettes:
[updated 4/11, check again for recent updates!]
Top 5
1.*[ScatteR]*(Remix) Sp1r1t
0:01-0:15
This piece makes audio panning beautiful, not a headache.

2.Break Fairy cycerin
0:40-0:55
Another Cycerin "under the radar" hit. The trance/hardcore style shines

3.Bass Babyd[+_+]b sp1r1t
2:15-2:30
H@|2DC0|23 !!!!!111

4.Operation:Evolution Dimrain47
0:53-1:15
The guitar is unmatced by ANY people the usually do "Heavy Metal".

5.Blake Reary-Hanging On Remix DaGrahamCraka
0:44-0:58
The acapella is okay, but the backgrounds is what makes this part SHINE!

Honorable mentions:
Nav - Space Sequence Nav
3:10-3:20

Lazy Summer Days Cornandbeans
0:55-1:10