I will be getting the iPhone 3G S, and I will be getting the Incase slider case for it (black). However I also want screen protection and protection for the back of my iPhone. I originally wanted to get the Zagg IS to use with the Incase, but I read here on MacRumors on a thread that the Zagg front and back would not work with the Incase slider (it wouldn't fit). So basically I want a combination of products to protect the front and back of my iPhone t ouse with the Incase slider. Now my question is can I use a regular screen protector such as the PowerSupport Crystal Film for iPhone 3G/3GS, along with the Zagg back only(becasue front and back doesn't work well with the Incase) with the Incase slider case, and not run into any problems? Any help is highly appreciated. Thank you!