Building my PC for Gaming and Machine learning

Hello, I need to assemble a PC for $2500~$3500 for Machine Learning (preparing models, Kaggle competitions...) and for Gaming. I'm doing machine learning training but I don't have a clue yet how much precisely GPU power I'll require in my ML venture, my thought is to assemble a PC with superb and expandable parts for Deep Learning with 1 GPU and include more GPUs/RAM later if necessary (min. 32Go RAM for start). I need to have the option to mess around in VR with an Occulus Quest. For the video card After perusing a few articles, I essentially set my psyche on an RTX 2070 which is obviously the best worth. I as of now have a great deal of HDD 3.5 that I can reuse, yet I need a decent 1TB SSD. I will associate 3 to 4 ultrawide screens to my PC.