Hi mikeymike. I have a 505 and, like you, didn't really like the standard case provided.
I bought one of these (
linky) which I now use all the time and I'm really pleased with it.
I suppose the one thing against it for your stated requirements is that it doesn't open like a book, but Amazon (UK) do seem to sell a black version of the standard one (
link here) if that could be better for you.
Hope this helps.