I'm about to receive my treo 650, my first call phone or PDA and I'm thinking of two case types to get...

1. A holster type case like the latch case treocentral is selling
2. a form fitting leather case like the SENA

But I am unclear about how you actually use the phone with both these cases. Do you...
a) take the entire case, including belt clip off your belt?
b) take the case off the belt clip, leaving the clip on your belt?
c) take the treo out of the case, leaving the entire case on your belt?