I've stayed away from these 12" figures, but this Leia is so nice. I am tempted to get her, but I know that then I'd want the ANH Han to go with her... then I'd want a Chewie to go with Han, then the Chess table, etc etc etc.
I'm in the same boat for the most part. I bought the initial Bespin Han, justifying it because Han is my favorite character - the ESB my favorite movie - and I've always enjoyed the "Bespin look" of Han. After I got it, I wanted more, and for awhile considered collecting all the OT-based ones. Then the Jabba set was announced, and I knew I would never be able to keep up financially with that line - especially if I wanted to buy anything else. Now, seeing this Leia, I'm awfully tempted to place a preorder for this one next week. But, I know if I get this Leia, I want an ANH Han. Then I always intended to get a Chewie (to go with Han), and then I'd want a Luke as well. Well, then I'd want the droids, and a Vader, and probably a Stormtrooper - anyways, its a slippery slope for me, I know that. It is awfully tempting though