Well, my problem is that it's a difficult and slow process for me to take a decision (any decision, like when I decided to buy an n800: I wanted it since it was available, then when I finally decide and I buy it, the following week the price drops 30% )
My stance on the cases is this

• The official case is gorgeous, the n800 is still pocketable with it but it is way overpriced for what it is and it offers almost no protection (if at least you could use the extra magnet to, say, use it in the car, it would be perfect, but others in this forum said that no way the magnet will hold the n800 in place)
• The proporta case is not as gorgeous but equally overpriced
• The cases specifically made for the n800 you can find on ebay are ugly as hell (well, they're not that bad), but they're cheap and the n800 is still pocketable with them (or at least so it seems)
• PSP cases are not so bad, they're usually very cheap, but they're too big: they seem to be good only for protecting the n800 and to store it with some accessories, but they'll not fit in a pocket
• ditto for the NDS lite cases. Maybe they're pocketable, but if they are they're probably too small for the n800

I'm thinking that my best option is to add a strip of velcro to the supplied soft case, just to avoid the n800 to slip out.