Well, you should first bear in mind that you are the customer and are paying for his services. As such, YOU have the final say in whether or not you want to take statins.
As for your numbers, LDL itself is not a very good predictor of CHD risk. Low LDL patients have heart attacks at nearly the same rate as high LDL ones. HDL/LDL ratio is a bit better as a predictor, but you have to bear in mind that this presumes that all LDL are the same. LDL particle size is an important predictor of CHD risk and particles tend to be larger and more difficult to oxidize in patients with high-fat diets, high saturated fat intake, low carbohydrate intake, and/or circulating ketones. As a result, you could have an LDL of 70 but have it all be Pattern B (small, dense) particles which oxidize easily and worm their way into your arterial lining or an LDL of 150 but have it mostly be the benign (and in many ways helpful) Pattern A type.
If he insists on treating a number, you should also make your doctor aware that the traditional formula for calculating LDL (Total - [HDL + (Trigs/50] = LDL) is innacurate for persons with low trig levels (sub-100, which you likely have if you have a low carbohydrate intake). There is another equation called the Iranian Equation -- (Total/1.19) + (Trig/1.9) - (HDL/1.1) -38 = LDL -- which is far more accurate.
Furthermore, statins have a pretty unimpressive track record as an intervention in the first place. Indeed, most of their effect, it's now emerging, may be due to an anti-inflammatory effect rather than their HMG COA reductase (a precursor step to ubiquinone and cholesterol synthesis) blocking activity. Ask him if, in light of the facts, he'd be comfortable with you taking low-dose asprin, niacin, and fish oil instead.