I am surprised no one has mentioned the case(s) at pdair.com.
I am on my seventh BlackBerry model and always favoured the ones where you didn't have to take up two hands: one to hold the case and one to hold the BB from which you've just extracted it.
For previous BBs, I have favoured cases from Sena and Noreve, but after a lot of looking for my Torch, I found pdair.
The one I have is at:
PDair Leather Case for BlackBerry Torch 9800 - Flip Type (Black)
and is a very reasonable $28.00.