Okay, I need to get a new iMac this weekend. Here is what I use my computer for: email, word processing with Pages, spreadsheets, iPhoto, watching YouTube, browsing internet, and some light graphic design. Do I really need the retina display or should I just grab one of the lower end 27 inch iMacs without the retina display. If so, is there anything I need to add to the computer or is it a pretty powerful home office computer with all the added bells and whistles. I was going to wait until the new iMacs come out but now I hear it's late October and who knows when they will hit the stores. Will the Apple store add more memory for me before I leave the store? Any help would greatly be appreciated.