Theres InvisableShield, Body Skinz, Best Skins Ever, PhantomSkinz, and the universal... None of these really cut down on the screen sensitivity.. InvisableShield is probably your best bet.. Its got a lifetime warranty and itll NEVER scratch.. Best Skins Ever are VERY cheap.. Only like $7.. But doesnt come with anything extra... PhantomSkinz are probably the clearest of them all.. BodySkinz has the smoothest surface so it doesnt affect scrolling.. All of the others have a slight texture... The universal.. No comment

I love hte invisible shield. I have had no problems with the stylus. The only thing I have to say is that there are several pieces. Wear rubber gloves and keep them moist with the spray that is included. Be liberal with the spray (it's just water). I made the mistake of installing my screen piece first and didn't use enough water. I suggest installing the battery door piece first to get a eel for it.
Buy it, it's great. i got two (one for my wife's iPhone) for less than one of those silicone covers for the iPhone.