Best Video Card for SW2017, 64bit, Win10. 

Get the most expensive 3D NVIDA  card

If your doing a assembly with 1000 parts too 2000 then i recommend Quadro M2000, but if sometimes your making an assembly more than 2000 then a Quadro M3000 is much more suited. The reason i recommend Maxwell series is that they will last much longer before solidworks won't support it but if you plan to stick with the SW 2017 version for a long time the i recommend the Kepler series the Quadro K4100 or K3100.

It all depends on what you want to do.

Small assemblies or large assemblies (as Jaja Jojo indicated).

There are high grade expensive video cards that would be a total waste of money if you are doing only small assemblies but would be the preferred ones if you are doing lots of renders or visualize processes.

I put a K2200 in my new system at home and it runs great and super fast - but I don't do large assemblies or rendering.

There is definitely no One card does all. You need to determine the best mix.

One DEFINATE - DO NOT use a card that is designed for Gaming - they will perform very poorly for 3D Cad.

If you can wait a few weeks, the SolidWorksWorld Proceedings will be posted and there will be videos of the classes that will give you a lot of great information.  one that will be good will be:

Here are a few slides from SWW2017 Cad Managers Boot Camp relating to video cards: (click on the images to enlarge)