Of course there is. I know quadros are very useful for CAT scan systems whereas a normal gaming card wouldn't be. However Quadros are several thousands of dollars each, not a very viable budget for the every day consumer
However any decent graphics cards from today (as in from 4 years to now) should be fine even for more complex modeling. Heck even lintel's latest built in graphics chips on their CPU's (which from a computer enthusiast stand point I ABSOLUTELY HATE) have enough horsepower and good enough driver support to be outstanding for use in Anim8or.
Of course though the more horsepower a GPU has the better anim8ors preview will run but there is a limit to how noticeable it is. For instance if I can render 30 fps max in the realtime preview render I am going to notice a difference if it ran 100fps max; but I wouldn't be able to tell the difference between 1000 FPS vs 10 000 FPS, because it runs silky smooth either way.
Now if you are running extremely high res models (several million polygons in a model), that would lower the frame rate count in the preview render so having that extra power GPU would be nice. There are also other benefits to having a better GPU like GPU specific features; but that requires your software to support which anim8or doesn't (things like PHYSX or Nvidia's new way of doing realtime global illumination which be it amazing I still don't think is as good as realtime path tracing).
So if you were looking for a new graphics card for mainly anim8or use on a budget, I would go with a lower end gaming card (70-100 bucks). They might not offer the best buck vs frame-per-second value, but they are cheap and they do work.
Alternativly you can sometimes find used older (but at their time, higher end) graphics cards for cheap that someone is trying to get rid of (if your lucky you might even get it FREEEE
EEEEEEE , that's how I got my GTX powered laptop).