My first preference would be to have HT do them, but that will take forever and a year, so if Sideshow could get on the stick with likenesses in 1:6 scale and improve their human bucks, I'd go that route.
Top redos:
Qui-Gon Ep. I
Mace Windu Ep II
Anakin Skywalker Ep III
Padme Amidala (queen and arena)
Luke Skywalker (X-Wing pilot, Jedi)
Leia (Bespin, Jabba's slave)
Han Solo (Bespin)
Lando (Bespin with smaller head & taller body, palace Guard)
** Aayla Secura -- not human, but would like to see a new one with a better face sculpt/smaller head, better body with a more feminine shape). Improved body could also be used for Talon, Oola, Shaak Ti and Slave Leia among others.