That is a little uncalled for, simply because you can’t decide what video card to get. Just remember you are getting differing advice from users who are most likely all doing different things.
You might want to check out the Holomark thread in which users have benchmarked their cards in Rhino: Holomark 2 Released!
The bottom line is Rhino can make most cards work. How much you want to pay to eke out every last drop is up to you.