In two minds over which 5k iMac to purchase. There's a huge price difference between the i5 and the i7 and if I can save money if it will suit my needs then that can't be a bad thing. I run a wedding videography business, currently using a very old PC-based system. I currently shoot and edit in 1080p in Premiere Pro with a Canon 5d Mk2. It takes forever to render or pretty much do anything. Typically any project I work on is around 60 minutes long and includes various transitions, effects, multiple audio tracks etc. HOWEVER I'm buying a Blackmagic Production Camera 4K (which naturally, shoots in 4K ProRes) next month. Although the final resolution of what I make won't be a 4k presentation (I always present in 1080p), I'd like to shoot 4K for cropping and reframing in Final Cut Pro X (I'm moving away from Premiere Pro). I also plan to colour grade with DaVinci Resolve 12. So looking at this spec: 5K 27" 3.2GHz Quad-core i5 32GB RAM (I have this ready to install) 256GB Flash storage AMD Radeon R9 M390 2GB Will this be able to do what I want it to fairly comfortably - DaVinci Resolve 12, FCPX, reframing 4k footage etc? Or should I go for the i7 4.0GHz with the M395X for a bigger price?