I'm getting into this late, but probably my favorite solo of all time is: "Shine On You Crazy Diamond" - by Pink Floyd. Others that stand out...
Night Ranger - Darn near anything. These guys could play and were musically intelligent as well. To comment on an earlier post, Gillis's 'Sister Christian' was one of his proudest writing achievements. I personally loved (and played!) 'Don't tell me you love me", but I had to make sure I played it before the 4th set when the beer started kicking in... damn that dexterity!
Queen/Brian May - the Dr. of tasteful solos, with musical knowledge that probably parallels his offline pursuits (He's a Dr. of ... AstroPhysics? Something similar anyway)
Gary Moore - Tone, tone, tone, tone - go finish your life - tone, tone, tone...
King's X/Ty Taybor - What a happy accident! I used to belong to a record club that sent out the featured disc before you had a chance to say 'no'. They sent me a King's X - Faith, Hope, Love I think - OMG. How does he do it?
Too many more to list, but God bless 'em all!
Pete