I'm using my iPhone 5 and the Ubersense app. It gets 60 frames a second, according to the app. I then use a video program called Sony Vegas pro to edit my video, which I have found has given it a lot better slow motion.
My other camera that would probably record at a high quality, is less easy to set up and analyze video on the spot. With my phone, quality doesn't drop too much and I can look at the video a lot easier using Ubersense(and it's free.)
Thanks for the comments. I agree my head is pretty "wild" and whipping around like yous stated. My concern right now is purely to throw as hard as I can right now.
But that is something that I do need to improve. I would like to have my head facing my target throughout my motion, or at least, a lot more than it does now.