I really like the idea of the same size, front and rear. Unfortunately, if using the stock wheels you won't be able to rotate.
You could buy ITP Delta steel rims (since you don't want aluminum) with the same offset front and rear, and then you would be able to rotate them since they would have the same width and offset. If you went this route, you would end up wider though. That is an issue if you ride restricted trails, or intend to haul in a pickup. For me, the extra inch of width would be an advantage. But I can't justify spending the extra cash on new rims at this time. You can run the same size radials, and they will have the same height even with different width rims front and back. @JACKAL has posted about this. He is running the same width all around and measured the height, and the front and rear match.