Remember the Mistubishi MPV minivan with 4 wheel drive!? That was an awesome minivan. I think Mitsu has come out with a new version, but it's more the luxury-type than the good ol' MPV was.
What about the Honda Vanagon or the Toyota M5? Those were good little 4wd minivans, too.
(I hope my Subi isn't reading over my shoulder... really Imp, I love you best!)