I have the black Apple case that is $39.
I really like it as it looks very sleek, has the apple logo on it, can stand it up or can use it like a slightly elevated keyboard. Close the cover and it's very unassuming.
The only downfalls...it's a bugger to get in and out of the case and also a bugger to plug it into the iPad dock with the case on. I don't even think it's supposed to be done as it's really cramming it into the plug. I bought the iPad dock extra. I don't think I would buy that again, as I can just plug it in with the supplied USB, 110 plug.
They were out of the Camera adapter, which I really wanted.