Ringtones for Phones

Now everytime I had a cell phone I always have to get a case because I’m super anal about those things. Now that I am soon to be getting an iPhone 3Gs i want super protection. I’ve had a Blackberry Pearl with a silicone case and I hated the fact that it scratched my phone while it was in the case. The corners of my pearl were still scratched when I took it out. I am looking for a case or some type of screen shields that won’t scratch my phone while on the inside. And I read reviews for the Invisible Shield which I hear leaves the screen sticky and hard to run your finger over. And when you remove the invisible shield it doesn’t leave the screen the same way it was when you first get the phone. please give me your suggestions. thanks!