My top three:

My Last Words - Megadeth
Creeping Death - Metallica
Children of the Grave - Ozzy Osbourne, from the Randy Rhoads Tribute album (NOT Iommi's version, which does not rock).

Hawk, Yngwie is good for ripping your face off with incredibly fast, balls-to-the-wall guitar solos (When I was a teenager, I was convinced that, if I ever learned to play a certain segment of "Far Beyond the Sun," I would become God--no, not really, but I hope you know what I mean), but he's not much for rocking, headbanging stuff.

For impressive guitar playing, look for the complete "Speed Kills" solo video by Michael Angelo. It's INSANE. Or watch him play his double-necked guitar with one hand on each fretboard, harmonizing leads with himself. Not something I'd put on in the car, but it's an impressive spectacle.

Back to headbanging, Iron Maiden should get at least honorable mention:

The Trooper
The Prisoner
Hallowed Be Thy Name (I arranged an acoustic version of this for laughs, but I love the original song)
Moonchild
Ghost of the Navigator


Oh yeah, and Judas Priest:

PAINKILLER (It has to be in all caps because listening to it will rip your balls off, or if you're female, you will grow balls, and a thick patch of coarse, curly black hair will appear on your chest and shoulders, and THEN the song will rip your balls off)
Hard as Iron
One Shot at Glory
Hell Patrol
Nightcrawler

(My favorite Priest album may be clear at this point)