I'm making the jump PC to iMac. I spent a large sum of money just 4 years ago on an i7 laptop and I've had endless issues with overheating it's now just unworkable. So I'm going to pay the extra and invest in an iMac. I'm a photographer who is getting a little serious with Wedding photography. Lightroom & Photoshop with a bit of GoPro action is generally what I need it to do. Usually simultaneously. Will I get away with iMac 27 3.4GHz 8GB 1TB i5 (3.4 GHz, 3.8 GHz with TurboBoost)? or should I go for the iMac Retina 5K 8GB i5 (3.5 GHz, 3.9 GHz with TurboBoost)? Is there anyone out there who uses an iMac for similar purposes? I want to be sure that I can multi task between these applications efficiently & quickly without any performance issues. Obviously the salesman at my local Apple store assure me it can, but this being my first apple experience I would like some user opinion. Thanks in advance.