Hi I'm wondering to either buy a brand new 24" 2.8Ghz iMac with 320GB Hard drive or a refurbished 24" 3.06Ghz iMac with a 500GB Hard drive. I will be using my iMac to edit High Definition video on Final Cut Express. Also can you change to a wireless keyboard and mouse when buying a refurbished iMac? What are refurbished iMacs like? Are they like brand new and do they have any scratches on them? Please help if you have any suggestions.