I actually found that my vertical swivel holster case for my Storm 2 is an excellent fit for the 9860... my 9860 has one of the blackberry premier cases on it and still sits comfortably in the storm holster... I would imagine these will be very easy to get hold off and fairly cheap!
Is it difficult to do a battery pull on the Otter? I bought an OEM leather holster. One complaint....the side buttons are not accessible, so I have to lift the phone to silence a call or stop it vibrating. Odd, my Tour OEM had access.
no there isn't any issues with taking the case off, but you should use an app like restart me to reset your phone then there isn't a need to take the case off except to clean the phone.