I am having a time with cases, but have decided to go thin. I can get the Air Jacket right away at the Apple store but it looks like the black Feather is on backorder everywhere. Anyone had both? Read some reviews on Apple.com about the AJ - folks said the matte finish came off pretty quick. Also - should I also go with the Crystal screen protector? I really like the 3GS screen, but with a thin snap-on case, I feel like I might need a little something more on top.