Gaming is a hobby but something I like to pass the hours. I'll in the main use the iMac for photo & video editing. I've considered building another PC but want to first visit the iMac as I have the apple Eco-system. What do games like Battlefield 4, Company of Heroes & Civ 5 run like in 5k on boot camp (or OSX). Which graphics card would you recommend. It's a compromise for gaming but want to explore it but making a decision.