I recommend the GTX750Ti.
Here's a quick guide but the HD7850 /R7-265 /GTX750Ti are all roughly similar, however you'll need to factor in current PRICE and the GPU frequency to determine value.
In some games the GTX750Ti even beats an HD7870 but in most the HD7850 and GTX750Ti are nearly identical.
http://www.techpowerup.com/reviews/ASUS/GTX_750_Ti_OC/25.html
The GTX750Ti uses a lot less power and runs QUIETER than previous cards as it uses the new, efficient, Maxwell GPU.
Here's the card I recommend for $150:
http://pcpartpicker.com/part/msi-video-card-n750ti2gd5oc