I'm new to the forum and need some help. I'm comparing the late 2015 27" iMac mid-tier base model with 512 GB SSD vs top tier model base model with 512 GB SSD. It looks like the difference between the two is the step up to a 3.3 Ghz processor and M395 AMD RMD video card on the top tier model. I will be using my iMac for spreadsheet, iBank, minor photo editing, music and basic home use. Should I step up to the top tier model for a $100 price difference?