Hi, I've been looking all over Amazon for a rugged case with built in screen protector but haven't come across much. The ones I have found aren't clear about whether the screen protector needs to be stuck on or is part of the case. I need a case I can use when I use my phone as a satnav and don't want a 'permanent' screen protector, so something built in to the case would be nice. Something that covers the ports as well would be good. Any suggestions? Thanks!