Marc, several people have mentioned track saws. If you've never used one, you're like me before I fully understood just how good they are. For large crosscuts like you describe, I don't think a table saw can rival the accuracy and clean cuts of a good track saw, to say nothing of the safety issue. Maybe a slider, I don't know.

The Festoolers swear by that brand. Me, I'm happily amazed by my Makita.