I have a 10 year old son. Considering a console system for him this holiday. We have a Wii, but I don't know enough about Xbox vs. PS3. I get that both connect to the net and can do lots of different things there. My biggest question is HD space. How much do you really need? The 4GB Xbox, it that just ram or is it a HD? Can you add a HD? If so, does it have to be an xbox drive or can you get any HD on the market? Any thoughts or suggestions on which is "better" (I know that this question is a bit of a personal preference). Last question, what are the basic must have's to start a system that are not included with the system or bundles. THanks much.