So I have an iMac from 2006; it is the 1.83 gHZ 17in. Core 2 Duo model. It currently has 512mb of RAM. I am going to max out the RAM and put Lion on it so it will be more of a modern Mac and we can use it more easily for everyday stuff. However, I'm confused as to what RAM I need. I'm pretty sure it goes up to 2GB, but where can I buy the RAM online and what kind do I look for?