From The Empire Strikes Back, this classic Bandai Star Wars 1/144 AT-AT model kit has great detailing, even down to the removable side paneling.  The legs feature movable joints that can even bend low enough to recreate the massive behemoth's collapse. 

This kit includes a 1/144 pilot, landing gear options, a snow themed dedicated display base, decals laser effects, leg dampers, articulated head and legs, and laser guns.