I use the Acase Leather Flip Book Jacket/folio. It's good in terms of adjustable heights. It even has a band so you can hang it on a car seat headrest. I believe it also lacks magnets, so I wont have to worry about it affecting the iPad compass.
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I use this case and love it, has been the best I have found so far other then then otterbox.
Targus*|*THZ022EU*–*Targus Truss Case for iPad