I am thinking about upgrading from 2GB of RAM to either 4GB or 8GB of RAM. Is 4GB going to be enough or should I get a 8GB. What I do on my computer is below. I am thinking about buying it from the link below because it's so cheap. Is there any cheaper than this.
Daily Uses: iPhoto, Xcode, iCal, MS Office, iMovie (Mac App Store games. The most advance game is Asphalt 6 and Chopper 2). I like running these at the same time. Apps running in background: Dropbox, Cinch, Magicprefs and Sophos Antivirus
Make sure your model identifier in Apple menu -> About This Mac -> More info says either MacMini 4,1 or MacMini 3,1. If it says anything else next to the model identifier, that link is not for the correct type of RAM.