Pilot talk 1 & 2 (Ski and Spitta...a timeless combination)
Covert Coup (Spitta was spitting on this one)
How Fly (first mixtape I heard from him. made me a fan)
EDIT:
Weekend At Burnies (This album was dope too)
The Stoned Immaculate (A bit different than his other works, but I liked that he tried new flows on this. Production is nuts)
Fast Times at Ridgemont Fly (groovy mixtape)
Independence Day (ionno...I just like it)
Jet Files (really liked the beats here)
All in order for me
I would put This Ain't No Mixtape, but to me most of those tracks sound filler-ish.
On another note, what happened to Pilot Talk 3