it's multiple questions, really. 1. do I need to install the games on the PS3 to play them? either way, is it worth getting a PS3 with more internal memory? 2. can I hook up an external hard drive and use that to install games? 3. is there a major difference in consoles? I know the ones you buy new now are the "slim" model. is there any difference between these, namely in the ability to hack them or not? 4. is it worth buying a PS3 currently and is the library of games good? I'm sorry if some of the questions are noobish, but I'm a complete noob myself.