Those two ideas ("High budget" and "B-movies") are mutually exclusive terms. B-movies, in general, have lousy budgets. Event Horizon had a $60 million budget. By way of comparison, Star Wars had a budget of approximately $33 million, adjusting for inflation.
Obviously I disagree with you, or I wouldn't have said it in the first place. Budget has nothing to do with whether a movie is *really* a 'B' film, or not and comparing the budget of a recent film to Star Wars is just silly. Stuff like the Mummy, Mummy Returns, the Indiana Jones flicks, and yes, even Star Wars are all really 'B' movies. Nowadays the idea of the 'B movie' is a film aesthetic. It's a 'feel' that the moviemakers are shooting for, and really doesn't have much to do with actual budget.