I'm a photographer who uses Lightroom and Photoshop (occasionally). I'm interested in buying a 27* iMac to replace an i5 Dell which is giving me fits (support told me to resolve issue I'd have to reinstall Windows but I just did that last week !!). I hear that Apple's RAM is too pricey. Certainly that is true for upgrade to 32 GB (upcharge of $ 600). OWC is charging $ 198.99 for 2x8GB and $ 397.99 for 4x8GB http://eshop.macsales.com/shop/memory/iMac/2012_27/DDR3L. Crucial is selling 2x8GB for $ 171.99 http://www.crucial.com/upgrade/Apple-memory/iMac/iMac+%2827-inch,+Late+2013%29-upgrades.html Should I get the machine with 8GB and boost it to 24GB with the 2x8GB sticks? I've installed RAM in PC's before but never a Mac. Not sure I feel comfortable doing it on such an expensive machine.