Hey, I have a 2011 27" iMac with 3.4Ghz i7 and 12Gb Ram. What possible upgrades could be done to it? I was thinking of getting an SSD and fitting it internally. I've grabbed an older OCZ Vertex 2 120Gb SSD and connected it externally via USB2 and done a fresh install of Yosemite and it seems a lot smoother but havn't really installed anything groundbreaking yet. This is only a test and not permanent. Any ideas?