If you want a good video card just watch auction sites, the GTX 650 sells here from NZD 200+. (84 poundings)
I've just aquired a Gigabyte GTX 580 for $110 (46.2 poundings). ( NZ $ Price new, $700+)
Make sure it comes with a warranty and it's from somewhere legit in the trade and thats by far the best choice.
Still good enough to beat current midranged cards