My favourite solos are

Guns N Roses - November Rain, Sweet Child O Mine (First solo I ever learnt - off tabs it was heavily wrong until I corrected it by ear and then changed it to what I thought sounded better)
Led Zeppelin- Stairway To Heaven
Eagles - Hotel California(Not the original theres a live version on Hell Freezes Over played on classical guitar anyone serious about classical guitar should learn this)
Pink Floyd - Comfortably Numb
Thin Lizzy - Whisky In The Jar, Emerald(Thin Lizzy have so many great solos its hard to pick. I think the fact that alot of them go totally against the main tune is why they are bettter)

Theres more so amny I cant name