I like your last version the best, especially your tapering rear window, that was a nice touch, and looks better than the previous versions. I'm afraid your headlights may be getting a little too frou-frou-ey, like Nissan's "hook" headlights as of late, but they are definately an improvement over the first triangular variant.
I might suggest a slight rounding of your grille to fit in with the softness of the rest of your van. I'd say have a look at the Malibu's, it may be a good place to start.
Nice job so far!
-Chase