Cheapest GPU That Is Acceptable?

I need ideas for the cheapest acceptable GPU out there. The cheapest card that you would feel comfortable with. 

Anything under $200 is a waste so a xfx 7870 is what I would call the sweet spot for a graphics card unless you need cuda then the 660ti is the best

A 7770 is pretty cool runs most games on med-high settings no prob. Great card especially if your only gonna be playing MMOs or MOBAs. Plus it can play new games like DMC pretty well too. Ideal for low budget builds.

You could probably find a new 6870 for the same price as a 7770 and get alot better performance.