ATI Radeon HD 5970 or Geforce GTX 560 Ti



ATI/AMD has always driver support for their previous card. If he get warranty from sub-vendor then it dosnt matter. Warranty from sub-vendor is the fact.
 
and power supply because the HD 5970 requires some horsepower 180-watts on idle and (400-460)-watts during some games and benches.
GTX 560Ti is 33% less in power requirements.
http://www.anandtech.com/bench/Product/297?vs=330

OCZ GameXStream / 600W-700W / SLI-Ready / Active PFC