GT220 Upgrade

I am looking to upgrade my graphics card but I am a bit lost with all the choice.

I use my system for Photoshop mainly and I will be running two LG IPS 1920 x 1080 screens. So I need at least one DVI and one HDMI. I have no preference between AMD ATI and Nvidia. I have read that graphics RAM is more important with photoshop (I don't do 3D work) so I think I want 2GB.

I have an AMD FX-6200 BE running at stock speed. I have it running on a Gigabyte GA-970A-DS3 AMD 970A motherboard and I have 16GB HyperX RAM. I have a 750w power supply (slight overkill but I thought my last one wasn't providing enough power because my system just kept shutting down when I ran multiple programs)

I wondered if anyone could give me some advice? I have a budget of around £70. I would like to play a few games if possible but nothing too demanding as I use my xbox for gaming.

Thanks.