I myself recently bought a nice gtx 750 ti, great card for its price, and a huge plus that it doesn't need any 6 or 8 pin connectors (at least, not the MSI one and a few others...)
To give a general idea of it's power; I can pretty much put everything in DayZ SA on high-very high (excl clouds, who needs clouds...) and the quality thingy to 100%, running at around 150FPS outside of cities and around 40-50FPS in cities like berezino, 30-ish in cherno etc
DayZ is pretty much the only heavy/poorly optimized game I currently own