Replying to Convincing the Parents

Well Media and Arts this is the first time I'm coming to you for specific help, hopefully you can aid me in my quest for a camera. Basically this is my situation, I'm signed up for a photography class in August, the class will provide cameras for us to use while I'm at the camp, however I still want my own camera. My parents are pretty tough to crack so I decided to make an Excel Spreadsheet comparing different cameras and specs because I figure it's a good way to show my parents I'm dedicated to this whole ordeal and that I know what I'm doing. They don't want to drop $500-$700 on a camera without knowing all the details. This is where my problem arises, I have no idea what specs. to include in the spreadsheet. I know the basic factors like iso, aperture, shutter speed, mp, but I need to know what's really important to include and research. I'm pretty much looking for a list, and any help is appreciated. If you guys have any other good ideas please feel free to inform me.

Thanks Everybody!