Vai - For the Love of God (who can deny its power?)
Vai - the Silent Within (he has an uncanny ability to fit a solo with a lyrical song)
Vai - Rescue Me or Bury Me (I dont care what anyone says about 'Sex and Religion', its a fantastic album)

Please excuse my apparent narrowmindedness, I do like most of the solos listed above and many many others, but these come to my mind first.