Hey @Gothic Melody I feel your pain, I am also a 3D Motion Designer, and most people won't understand our pain when it comes to figuring out our key visuals by tweaking tiny things and having to sit and wait (for insert absurd amount of time here) until we are happy and can send to production render.
CPU is gold for us, we need to prioritize CPU over GPU (as long as a we got a decent GPU), UNLESS, you are using a GPU based rendered like Red Shift or Octane. Then yes, get a decent CPU and prioritize GPUssss, as many as possible.
I myself work with C4D, that's why I pay attention to Cinebench scores, and the AMD Threadripper are the best value/price you can get right now. I will be getting a 2990x when it comes out later this year, it's rumored to be around $1,500 - But you will get double the performance of the 1950x for less than double its price.
My current GPU is a 1050 Ti, I wanted a 1080 Ti but there wasn't any at the time and had to settle for a 1050 Ti and it works just great for me. I can work with fairly complex geometry and it stays smooth on my screen when rotating and smoothing my models.
If you have no need for GPU rendering go with a 1050 ti or the renewed 1080. Also, if you wanna save more money you may want to try a VEGA GPU.
RAM, I like the Corsairs LP, Try to find fast ram with low latency for best performance of your CPU, that way it won't bottle neck your workflow on something dumb as cheap ram. Also, I use my PC for work and very light gaming, I don't have anything RGB to save money and honestly I don't like RBG lighting anywhere. I would rather have a MAC but their systems have sucked in comparison to others for years now.
I hope this helps.