I picked up the Incase and have been very happy with it. The feel with the rubber case is a lot more secure and it doesn't add too much bulk to the phone. I toss mine around a lot and it still looks like new.
With the glass screen, I don't see a need for any sort of screen protector.
I pissed the hell out of the Flaming Gay Apple Nerd at the Apple Store in Vegas when I was opening the boxes to check out the cases. He sauntered up to me and started lecturing me on opening products in the store. I let him know if I was going to drop $600 on a phone, I was going to be damned sure I was happy with the $30 protector I was purchasing and that he better leave me a lone.
If Apple isn't going to let you open up the boxes to check out the cases, they need to display them somehow alongside the phones/ipods.