upgrade Looking to get a new Graphics Card

I currently have a ATI 5770 (but a version by HiS) and am looking to get a new card but an nVidia one.

I've had a few problems with this one like dodgy drivers causing crashes and blue screens along with something so simple yet incredibly annoying, the magnifying cursor also caused by the drivers. Tired updating and changing drivers to no success so I can't be bothered tbh.

I am looking to get a nVidia card that is equal or preferably a little more powerful than my current one. THIS is the card I currently have. I like the fact is had DX11, HDMI, crossfire compatible etc.
Only thing it needs is a dvi/vga slot and a separate HDMI port just because I sometimes plug it into my TV as well.

I never know what to get because there are so many out there and they all have different names.

I usually play games like Portal, GTA San Andreas, GTA IV and looking to be good for GTA V.
I'm looking to spent about £180 or close to.

Thanks

Looks like a beast.
By the picture it looks like it may get in the way of my other PCI slot, any ideas?. Just checking because I have a sound card in the other slot below it.

I have 2 PCI-E slots, graphics card in the top and sound card below, I'm not sure if there would be enough room for both or not, also the sound card may obstruct the graphics card fan. Hmm

The GTX 660 is the same thickness as your 5770, if your slots aren't blocked by the card you have now it shouldn't be blocked by the GTX 660.