There is no point in us listing computer parts. We have no idea whats available where you are. You need to list a sample build, and we will suggest changes. You'll have to look to see if they are possible, and let us know what else is available if you can't get it.
Lack of gaming cards isn't a big deal like Saaiello thinks. 3Ds max, Cad, etc don't really care about the video card. You might want to look to see if the version you have support CUDA, and if they do buy an Nvidia card.