I'm looking to buy the new 27" iMac and I don't know if I should spend the extra money for the 3.2GHz i5 or 3.4GHz i7. I'm a photographer and I work a lot in Photoshop CS6, Lightroom 4, and Photomechanic. Also, I tend to leave a lot of programs running all at the same time, in addition to the above, like Mail, Firefox, Excel, iTunes, Quickbooks, and Roes... and I'll sometimes add on another program or two just to see if I can get my computer to explode... Anyway, based on what I do, does anyone who understands computers, know if it is worth the increase in price for the added performance, and will I even be able to tell the difference. Thanks!!!