First Boston album
Vai's 'Passion and Warfare'
Machine Head's 'Burn My Eyes'
Fates Warning - Perfect Symmetry
Derek Trucks tones
Govan's tones - Aristocrats debut
These days for me it's more about everything else making the guitars sound huge, rather than just the guitars themselves... if that makes any sense.
edit: Oops, forgot one.... Steve Salas tone on Sass Jordan's 'Rats' album.