I would say the OEM Blackberry cases have the optimal location of the magnet (which is used to set the phone to sleep) so they would work best. I really wouldn't want to try it with any other type of case which might have stronger magnets, which may/may not damage the phone.
wrt the alerts, open the menu that allows you to set your ringtone profile (normal, loud, silent etc) and scroll down till you see advanced. Once in advanced, you can set pretty much any sound that the BB will make.
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