The pinnacle of old technic: the Space Shuttle 8480. This set is one of the highest quality old ones I ever got my hands on, and complete as complete can be. :
Space Shuttle - LEGO set #8480-1 (NISB) (Building Sets > Technic)
Technicopedia: 8480
Space Shuttle : Set 8480-1 | BrickLink
Classic Review: 8480-1 - Technic Space Shuttle | Rebrickable - Build with LEGO