I've found a GPU that's in my budget range and looks fine too - an HD6670 1GB GDDR3, which is fine for the power supply too.
The only problem is fitting, would it fit into an Optiplex 760 MiniTower?
Here are the product images: http://imgur.com/a/mBk7B
The only problem is fitting, would it fit into an Optiplex 760 MiniTower?
Here are the product images: http://imgur.com/a/mBk7B