A (cough) Gorn. Actually a re-use of Mego's "The Lizard" sculpt (from their "World's Greatest Superheroes" line) with a Klingon uniform.
Perhaps my favourite, the Andorian. Beautiful head sculpt, and who can resist leather with a sparkly silver jumpsuit?
Belts, phasers, communicators, and tricorders. Thirty years has taken its toll.