If you are worried about your screen getting damaged while in your pocket I suggest you look into both a case and a screen protector. There are several threads here on PPCG that discuss both cases and screen protectors. Personally I am using the OEM hard case that they sell at the Sprint store and I love it. I am also using the Realook screen protector. You can read a few screen protector reviews here:
http://wiki.ppcgeeks.com/index.php?t...een_Protectors
And if you look through the accessories forum you'll find several reviews of cases. The Seidio surface seems to be pretty popular and has gotten good reviews - although there are reports that it scratches the phone.
Here are a few links you can look at. I'm sure there are more.
http://forum.ppcgeeks.com/sprint-epi...6k-beware.html
http://forum.ppcgeeks.com/sprint-epi...-question.html
http://forum.ppcgeeks.com/samsung-ga...rotection.html