I have to say, Having used the SGP Neo Hybrid, the Otterbox Commuter and the Case-mate barely there for this phone, I prefer the SGP. Yes, the speaker cutout is slightly off, but there's a lot less bulk than the commuter, and provides better shock protection than the barely there (which basically provides none).
The Otterbox Commuter is absolutely solid, and feels like it could take a substantial drop, but essentially doubles the thickness of the phone, which makes it incredibly difficult to hold in my hand =(