Well I just got a new phone, the Palm Centro. And I was wondering which case would be better, a snap-on case or a silicon case. I've noticed that with my iTouch, which has a silicon case, when I have jeans on and when I put it in my pocket it takes a hard time to go down. And I don't want that for my phone. Would a snap on be good? Do they scratch the back of the phone a lot? And I'm putting in mind maybe buying a holster to hold the phone? Are those good? Thanks!