Well, the processor and the ram for rendering, the graphics card would be just for simulating your object in 3d space, although i think that videocard it is the same as graphic, i think i understood what you might mean by video, some of graphic card with enought amount of ram and processing, yeha they are really expensive, so i guess it isn't include on your cheap finances...
Just look for an average graphic card... And focus on the processor and ram.
This is what makes your render faster....

I hope you find it usefull...
^^