I'm planning on buying a 3.55 PS3 to mod soon and I've been looking around at FAQs and tutorials trying to figure out exactly what I'll need. However, it seemed like some of the information I found may out of date, so I was hoping that I might get a few questions answered here. 1. I will probably want to be able to run disc backups. Should I buy a USB hard drive for this purpose, or is it possible to install and run backups from a PS3's built-in hard drive? Also, about how large are most PS3 backups? 2. It's my understanding I should get a Slim - is there any real upside or downside to the different available models? Are older models more prone to break or anything like that? 3. Sorry for the vague question, but is there anything not obvious that I will probably need or should know about before I begin? Thanks for the help.