I think it depends on what you want in your collection. There are some very hard to get items, but it really just ends up being a packaging variation in the end. A lot of the earlier figures were released on different colored cards, then with freeze frame slides.
There were some different actual figure variations, Brown Vest Luke Jedi, Boba Fett with half circles and full circles on his hands, and the the ever favorite long and short sabers, but I don't think any of these are "worth" a whole lot more than any other POTF2 figure these days.
My advice, just look around and try to get what you want.