I have basically the same set up you have and the temps were about the same. I just put an ANTEX Truepower 430 psu in my box and my temps did a pretty good drop.
Now running 43 idle and 48-50 load with 2500+ oc'd to 3200. Was running 46 idle and 52 load before putting it in.
Plus the added benefit of a super quite system now.
heatsink is the thermaltake silent boost. Now my hard disk is the loudest thing on the system. I used Artic Silver 5 on mine, but it is still in the 200 hour break in, so not sure how low the temps will eventually go.
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