After trying the Sena case and finding it to be too bulky, I was thinking about another option. I carry the treo in my pocket, so all I need is a screen/keyboard cover that is easily removed when not in my pocket. Not finding any available, one thought was to get a holster, which could act as a plastic front cover (see Seido Holster)

From those who have a holster, would something like this work and how bulky does it make the Treo?
Can I remove the belt clip to make it fit easier in my pocket?
Or, can I latch the belt clip to my pocket while the treo sits inside the pocket?
Are there any other holster options available?