Choosing 1 is difficult, so I'll go with my standard top 10 favorites...
10. Death Star Droid Freeze Frame
9. Luke or Han in Stormtrooper disguise
8. Ishi Tibb
7. Biggs Darklighter Freeze Frame
6. Luke Bespin w/Removable Hand
5. Darth Vader w/Removable Helmet
4. Death Star Trooper
3. Wuher COMMTech Chip
2. Sandtrooper
1. Chewbacca as Boushh's Bounty Freeze Frame
You really like the Death Star Trooper? I think the detail is pretty good, but I hate the way it's posing. You can't tell if he's trying to run away from something or if he's pinching a loaf (look at the stress and pain in his eyes!).
(http://www.chrisrhoads.com/images/death_star_trooper.jpg)