On my system (see below) my temps were about the same as yours with the stock heat sink and fan. After I got a Swiftech MCX478 hs and a thermaltake smart case fan II, my temps dropped to about 40C idle and 50-55C idle. And my case temp is still to high...cpu fan takes in to much air...messes up air flow...with better air flow for my case, I would see even more change in the cpu temp. Getting a good hsf is the best thing you can do for you temps!!!