Realistically if you are happy with the performance of your card then there is not much point in upgrading. That said with your budget you could go to a hd 7770 which would be a noticeable boost in fps with similar power use.
If your just after power and heat savings I wouldn't bother as your card doesn't use that much to start with.
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Desktop: X3 710, 4GB DDR2 1066, MSI Cyclone GTX 460, Seasonic S12II 500W
Away from home light Gamer: Acer Aspire 15.6", A8-3500m, 4GB 1333
Internet/General Use: Lenovo B570 15.6", i3 2330m, 4gb 1066mhz
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