I have a BU cam that displays in the mirror and HU and I have to say that the mirror display is fully usable and just fine. One other option would be one of the units that comes with and LCD screen that you can put on the dash or cubby. Another alternative (something I have in my 4Runner) is a dual camera car DVR. You can set it so that either the front or rear or both cameras display in the 2.5" screen. I think I paid less that $50 for it and it has served me well.
The $25 ebay cameras work well enough if you go that route.
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