You are correct when it comes to what is needed for rendering programs. A high core count CPU, a good GPU and decently high RAM are all great when it comes to 3D Rendering.
Here is something I came up with; https://www.microcenter.com/site/content/custom-pc-builder.aspx?load=062da6f5-4637-4c06-b8e8-3ffc4c2d7774
about $837 before tax and leaves ~1,100$ for a GPU to pick since these can be pretty hard to find at the moment.
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