After using several different cases since getting my iPhone 4 on launch day, I've been using it without a case for a few months. I've currently got a powersupport crystal on the front, invisible shield on the back, and luckylabs spectra wrap round the sides. My question is, I'm thinking of getting an otterbox defender for taking my phone on holiday, to protect it on the beach and from any splashes around the pool, but wasn't sure if the built in screen protector plus my ps crystal would make the screen unresponsive? Does anyone use a similar set up, and can give me some advice? Thanks.