A free one. Screen protectors aren't worth any amount of money. Your screen is already scratch resistant. That layer of film you're applying is only good for gathering small air bubbles, attracting smudges, and scraping up pocket lint.
That being said, if you buy an Otterbox, it comes with a screen protector. I tried it on my Rezound and it seems fine. Don't get fooled into that "military grade" marketing crap if you go buy one. They're all the same.
Skinomi. I've tried wrapsol, zagg, and steinheil. I always come back to skinomi.
Yeah, ever since the Droid 1 I cant stand the feel of screen protectors. And it turned out I never needed it.I used to use a ZAGG one. But when I replaced my phone and decided not to get another one. I forgot how smooth the glass was. So I kept it off.