I got the light gray poly. Not a fan of some of the colored ones, and there's no way in hell I'd spend the money for a leather one. Got a new open box one on eBay for $20.
Dark grey. I would've went with a black leather one, but my dad's started falling apart pretty quickly. Looks really bad now. If they made a black polyurethane one (or any non-pastel colors) I would've went with that instead.
Tan leather originally for my iPad 2. Cream leather for my iPad gen 3. Both have held up perfectly and look just about the way they did when I got them.