One other thing not totally obvious to consider is how you are going to sell your product. Are you only showing it in your office? Or are you giving it away to clients. Do you want your clients to run the project on their computer? It might not be a high end one. I know people are selling computers with the projects but then the price of the hardware will most likely go out of your fees.
I’m using a 1070, not because I can’t afford a 1080 but to keep in touch with the usual guy who probably won’t have the most advanced video card. - Just a thought.