Video Card for AutoCAD 2016

I don't think you need a $400 GPU for auto cad. Although if you do some gaming on the side I can understand. I'd go for a GTX 960 that should be way more than enough. The PC's I used at school only had Intel integrated graphics and auto cad worked just fine although a little sluggish. The GTX 960 by Nvidia is about $200 and will perform pretty well in games as well
 


Perhaps consider a solid gpu such as the 960 and an SSD if you don't already have one. That'll make everything way quicker and snappier.