According to the reviews I've read the GTX 460 has a great price, it is quiet, it uses less power, it performs as well of better than the HD 5830 and it can overclock very well. There are two models that have been developed. The $220 model has 1GB of 256 bit GDDR5 and the $200 model has 768MB of 192 bit GDDR5. Based on what I have seen, both models overclock very well. For an example check out this graph from [H]ard|OCP.