Well, the nemesis prime version came in a black and white box that has a bunch of people's autographs for some reason. My cousin bought it at a hop in Tokyo and there was a signing. Not sure who singed it, but I know it's worth a ton.
EDIT: I can read on of the autographs right now and I think it says Hidetsugu Yoshioka, another that says Suchin Poa.
Voyagers are usually alot bigger, and sometimes better. Voyagers also cost a full twenty some bucks. They're alittle more difficult to transform and have something to do with the actual size of the charcter. Using the size to figure ration. Meaning, you won't find Optimus in the 'deluxe' area. Let me break it up for you.
Deluxe Class, easy to transform smaller 'bots include:
Bumblebee
Arcee
Barricade
Scorponok
Jazz
G1 Jazz
Swindle
and a few others...
Voyager Class, quite abit bigger and alittle harder to transform
Starscream
G1 Starscream
Thundercracker
Blackout
Iron Hide
Ratchet
G1 Ratchet
Leader class, quite expensive, difficult to transform and they're big motherf*ckers:
Optimus
Megatron
and to a certain extend, Ultimate Bumblebee.
Hope this helps ya.