Which 27 inch iMac model is the best to buy at the Apple Store for a good home office computer that's fast for email, word processing, using iPhoto, watching YouTube, Internet, spreadsheets, Pages, Numbers, watching movies, etc. They are as follows: Basic 27" model monitor with basic 7200 rpm 1tb hard drive, no retina, 8gb of memory. 27" retina 5k monitor with basic 7200rpm 1tb hard drive, 8gb memory. 27" retina 5k monitor with 1tb flash drive, 8gb memory. I want to be able to walk out of the store with the iMac so I will need one of the models above with no modifications. I also don't want to over buy if I really don't need it. I just want a good basic computer that is fast and the best desk for the money. I believe the difference is about $200 per model so the high end bottom one is about $4-500 more.