I intend to get a new non retina 21.5in iMac shortly but am a little confused. I use Adobe Photoshop and Lightroom regularly on my old iMac (2007 running Lion OS with 2.5gb ram) which chugs along a little slow at times. I have researched the new iMacs but now confused with ram v fusion. I originally thought of increasing the 8gb ram in the new iMac to 16gb but then was told fusion was a better bet for overall performance and cheaper. Unfortunately I cannot afford both so I have to decide which to go for. I am assuming SSD is my hard drive, correct? Thanks.