I have a Corsair One I bought about 6 months before JWE released. I could run everything on max without slowdowns until the dino count on Nublar got close to 100. After Claire Dearing DLC my NVIDIA GeForce Experience app started advising an option set less than max everything, although I've only noticed slow downs on Sorna with 30 or 40 dinos + 16k guests.
CPU: Intel i7-7700k
Graphics: NVIDIA GeForce GTX 1080
Memory: 16k RAM (8K x 2)
I don't remember the exact price. It was like $1,500 in Q1 2018. Buying an equivalent now should be a bit cheaper than that I should think.