i need a pc that can run cinema 4d and maybe octane, i also want to play cs go and my budget is $500
What is your budget? For such tasks, a cpu with multiple cores is ideal. These softwares are heavily threaded.
Woah you're in a tough situation. 500 dollars, in my opinion, is not enough.
how much would a good pc cost for cinema 4d
I would say good would be like 2K would be classified as good. If you are doing it professorially I would dump as much money as possible into it.