They have some "pro" 60Hz screens coming in q1 2015, but I don't think 50" is one of the sizes.

http://www.techpowerup.com/202448/seiki-announces-a-trio-of-...

That's the same one I have - currently $339 on Amazon. I've been very happy with mine, especially for the price.

What video card are you using with it?

Yup, that's the one. Surprisingly good looking panel for the price, once you change it to a limited color space and tune the color settings a little.