I re-watched my "Pleasantville" DVD today and was pleasantly surprised. Marley's really photogenic onscreen (a lot more than the stills I've seen, certainly) and she played innocent really well, without seeming stupid. I can really see a lot of qualities in that performance that will work for Vicki.
And yeah, I think PJ Hogan is a wonderful choice of director - a lot better than Bowman in some respects. While I like a lot of Rob's work, he doesn't really strike me as an "actor's" director, and he has a kinda slick coldness to his stuff.
Hogan's track record is much more character-based, and should certainly nail the romance element. I can really see his take on "Dark Shadows" being much more fairy-tale and magical, with child-like wonder. Could be good