My 2009 iMac is no longer with us. I am going to buy a new 21.5" iMac and my question is on storage. The options are (as you know) a 1TB Serial ATA Drive @ 5400 rpm, a 1TB Fusion Drive or 256GB Flash Storage. I will use this iMac as home computer, nothing fancy at all. I currently have 500GB Serial ATA Drive. I back up using Time Machine (1TB). Any thoughts on storage? Thanks in advance.