I have an Arctic Cooling Freezer 7 Pro CPU cooler (which is mounted correctly, it doesn't budge and was cleaned before reapplying thermal paste when upgrading from E6600 to Q6700), and used MX-2 Arctic Cooling thermal compound and am getting those temps at idle. I opened the side panel of my case and temps went down to the low-mid 40's. I was looking at this cooler http://www.newegg.com/Product/Product.aspx?Item=N82E168...
as a replacement since this one doesn't seem to be doing very well cooling a Q6700.
I was also thinking about replacing the stock rear fan with a high flow model.
But mainly, why is that CPU value negative? Is it just refering to the spread remaining from the Tj. max value or something different?