I can comment on the anti-glare vs. crystal. It really is a personal preference. My sister and dad have the anti-glare. It does not show fingerprints smudges, but it has a slight "glazed" look to it. The colors are not as sharp.
I have the crystal. The colors definitely "pop" more with the crystal, but it becomes a mess. It shows every little smudge and fingerprint and when I wear makeup, it always ends up on the phone, especially on hot days. I carry around my cleaning cloth in my purse with me for this purpose.
All that being said, I like the crystal. I like how clear it is. But it really is up to you. My dad and sister have both said that they'll take the glazed look over the fingerprints.
MileHighRob has the incase slider and he absolutely loves it. As do many people who have it here. I'm tempted to look at it, but I have the Contour Flick and an Agent 18 skin. I'm thinking that 3 cases for one phone might be a little excessive