I bought the standard flip case and have to say that there are a few things I would change. It would be really handy if it had a strap of some kind 1. to keep it actually closed (mine has started to slip a little) 2. to prop it up like a stand. I would also widen the hole near the front speaker so I could see if the indicator LED was flashing and maybe a opening so I wouldn't have to hold the thing open in order to take a picture from the rear camera. One last thing. This particular case seems great for protecting the screen (I tend to just put it in my purse with pens etc), but on the few awful times that I have dropped it (it's really pretty slick) the whole thing pops off, since it replaced the back cover. I probably need something more substantial and grippy, but then it might be too big.
I keep looking for "the perfect case" because I LOVE my N2 and take it with me absolutely everywhere.