I think the title says it all ... but seriously OtterBox is the way to go.
I got a BlackBerry Bold 9700 Commuter Series Case
at WES (just by going to the booth and asking politely) and I wasn't sure if I would actually use it ... but it was swag and I wanted one.
I got the case put the screen protector and 2 part case on the device and haven't looked back. Having used a Bold 9000 for year and then going to the 9700 it was a bit of an adjustment from the big device...