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I got Skinomi Tech Glass and couldn't be happier. It feels like glass, seems very durable, and easy to install. Doesn't block the front-facing camera or the sensor. It's glass, so you have fingerprint marks on it if you have oily hands, but it comes right off when you wipe it with a piece of cloth.
As far as screen protectors go I went to the mall and got a Ghost Armor one from a kiosk and it works great. The other ones I recommend are Skinomi and Invisible Defender. They're all good.
As for cases I just got this one today Bear Motion. It's a small case and it fits great. It's material is like the sandstone backing of the OnePlus One. I really like it.