How much is the total of the system you built vs this here?
This being way better than what you linked. The gtx 460, being more efficient yet more than twice as fast as the 4670, allows for a smaller sized PSU.
The i3-530 is GUARANTEED to run at 4ghz. You might have to add a bit larger heatsink (might even do on the stock one).
At 4ghz it is as fast as an AMD 940 quad in cinebench.
But really, compare the complete system cost and not the parts of the system. That s not the right way to look at it.