The 16" MacBook is a bit out of reach for me now and I see myself grabbing the 2020 model when more 16"s are on the secondary market. That said, I've considered the idea of beefing up the GPU power of my existing i9 15"; has anyone done this? I would be doing it for both gaming and video editing (Premiere and DaVinci). Of course, it wouldn't make a lot of sense to spend $1000 on this because I'd basically be paying for a 16", so I'd be looking at older/used setups. Thx!