I've been told both various people that if I want to do heavy video editing to simply build a PC however I'm still trying to find a work around due to the fact I have a iPhone 8plus and a 2015 MacBook Pro. I feel I want the 5K 27-inch 2015 iMac i7 for my desktop workstation but what's the realistic expectation of the machine doing some solid video editing? I'm not extremely experienced but want a machine good enough to start me out with video editing, learning Premiere and After Effects. What's some specs I should be looking for a must have for my needs?