That might not be a correct answer, but I just love the archetypes for the vigilante, because they essentially all change the vigilante identity, while keeping the social identity mostly intact.
Avenger and Stalker... are essentially archetype-ish in their designs as well while they are specializations, so it's good to have even more specializations for the class ^_^
For the other classes... hmmm...
Bolt Ace (Gunslinger): pretty good way to have the class without the guns ;)
Ghost Rider (Cavalier): Having a spectral mount saves you a lot of resources :P
Mooncursed (Barbarian): You become a lycanthrope while raging... up to Huge :D
Grenadier (Alchemist): Replace poison by better blast zones, always good to have :)
Winged Marauder (Alchemist): Aerial bomber, nuff said XD although... pretty sure you can select a roc instead of a dire bat or giant vulture.