I am looking for a few suggestions please... I have been doing a little bit of homework on my next video card and I have come up with the GTX770, R9 280x/290. Historically I have always gone towards NVIDIA but I am open to buying the AMD equivalent. So my question is are the models above a good buy? My other concern is I have a Corsair CX500M power supply and I am unsure if I will have sufficient power for the upgrade? Your suggestions are really appreciated! Cheers!