I'm using this Anker PET protector and am pretty happy with it for the price ($5.99). It's only slightly sticky to the touch, but it doesn't bother me. Responsiveness doesn't seem to be affected by it. It was the first protector I'd bought, and I screwed up 2 of the 3 pack while applying - I let Anker know and they sent a replacement at no cost.

http://www.amazon.com/gp/aw/d/B00GHD28BS?pc_redir=1396407679&robot_redir=1