Purchasing a 991.1 Turbo S

Hey guys, i've been a BMW guy most my life, but owning a 991.1 911 Turbo S has always been in the back of my mind.

I'm aware that these cars hold value extremely well, and i wanted to ask where do you all feel like these cars are at in terms of depreciation? Have they hit their bottom, or do they have more room to drop? I'm planning on buying cash and want to drive it for 2-3 years without losing more than 20-25k on the car. Do you guys think it's possible? Thanks