For $2000, you can do well. For sure, you should get at least 8Gb of RAM, though I would get 16Gb (6Gb/12Gb for triple channel motherboards).
Understand 3D modeling and video editing are best done on graphics "workstations" - computer hardware designed for that type "work" where gaming machines are done on computer hardware designed for regular computing tasks and games.
As seen
here, a high-end workstation graphics card blows your budget to pieces. So you need to set your priorities. Do you need a serious workstation for serious "work" tasks? Or do you want game machine for play? You can do work on gaming machines, but workstations do not make good gaming systems.
Since your quote tells us nothing specific (no model numbers) we have no way of telling if that is good enough or not. For example, Newegg sells 12 i7 CPUs from
under $300 to over $1000.
Select your PSU last, after you have determined your power requirements and get a supply that is 80-Plus certified from a reputable maker.
Don't forget to purchase a new Windows license for this machine.