I'm a writer and I'd like to buy a Mac because I hear it's dictation tool is fantastic. I also want some USB ports so I can plug things in. But don't need to play CD's. I won't be playing games on it but I love the iBook software so I can format books. I think a Mac Book Pro is what I need. However, I'm also a poorly paid writer so I'm looking for a 2nd hand model. My budget is about $700. Can you tell me which model I should go for?