Hmm, I don't know if Carrara is too good for the booleans, but Amapi (Amapi Designer 7 comes with Carrara Pro) is pretty good. The demo version of Amapi can save files, at least a3d files from what I remember, but Amapi takes a little longer to learn, and from what I've seen of it Amapi Pro's interface is a lot better than A7D's interface, but also comes with a bit of a price tag.