So now the refresh has happened, I need to decide what iMac to get. I'm a visual artist who has made use of Adobe programs for a long time... but on PC. I now want to do some video work that will include things like After Effects and Final Cut. I want to get the 27" iMac, but need to know which one is for me. Do I want the i3 or the Quad-Core i5? Or perhaps the i3 with an upgraded 8GB RAM? This will be my first Mac... and I appreciate any advice.