I am currently using the case that came with my Tour and I like it except for the large clip on the back. I never clip my phone onto anything. My requirements for the perfect case would be:
slim
magnet - I like my bb to sleep
not leather
easy to take the phone in and out
no clip
the case should cover the screen
You can, with a bit of force, remove the clip. There will still be a hunk of plastic, but it works well for just carrying the BB around in a brief case, for example.