I was thinking the same about screen protectors. My LG Optimus 7 came with a protector and I got used to it but now that all new phones are using Gorilla Glass 2 I think I will be rocking my 8X (it's on the way already) without a protector, at least at first to how resistant is the screen to scratches.
About cases, I ordered a California Blue (made by HTC) to go with the black 8X I ordered. The value of the cases is that you can always forget about looking where you put you phone on. You can it scratch by reaching to it and dragging it along a table or other surfaces.
I will try the cover as soon as the phone arrives and see if diminishes the great touch and feel reviewers are bragging about. If it does, I will use it without it with the hopes it doesn't get scratched/damaged too soon