An interesting thread, I can play along...
1995: Stormtrooper (as we have no choice)
1996: TIE Fighter Pilot
1997: Snowtrooper
1998: Endor Rebel Soldier
1999: Commtech Stormtrooper
2000: Security Battle Droid
2001: Imperial Officer
2002: Imperial Officer (SAGA Variant)
2003: Clone Wars SA Clonetrooper
2004: TIE Fighter Pilot
2005: ROTS SA Clonetrooper
2006: Utapau Clonetrooper
Hmmm notice the coincidences, some figures were always top notch. If I were to do this by line, I would do it the following...
POTF2 (includes SOTE & EU): Snowtrooper, runner up - Endor Rebel Soldier
Episode 1: Battle Droid (Standard), runner up - Destroyer Droid
POTJ: Imperial Officer, runner up -
RFT (nah JJ just kidding

) Sandtrooper
SAGA (includes Clone Wars): CW SA Clonetrooper, runner up - TIE Fighter Pilot
OTC: Cloud Car Pilot, runner up - no other 1st release army builders in the OTC line
ROTS: SA Clonetrooper, runner up - Clone Commander
TSC: Utapau Clonetrooper, runner up - AT-AT Driver