I'm half and half...my top half is mostly maternity and my bottom half is mostly not.

Actually, lately I've been wearing exclusively non-maternity bottoms, mainly the same pair of jeans and various fleece and pj pants. For tops I've found it easier to wear maternity, because they are cut longer and I've been wearing my pants lower under my belly. I do have a few tops that aren't maternity but seem like they could be.
I told myself I wasn't going to purchase any more maternity clothes, but I think I'll probably get a few dresses for the last trimester...then I won't have to worry about pants at all.