not to kick a dead horse as sd, ceo, and others have already said the truth, I will add that there is a difference between lean muscle (what you say you have now) and true muscle mass (which most of us on here strive for). basically you look good on the beach but when you have a shirt on people cannot tell you are muscular.. you want that lean muscle look, then stick with what you have been doing with a lot of cardio and light weight training.. really you don't need roids at all.
if later on you decide to strive for the true muscle mass then you want to lower the cardio and bulk up through weight training and diet (i have a bulker in my signature designed for guys like you) at your height you can easily get close to 200 naturally IF that is what you want to do.
if later on you decide to strive for the true muscle mass then you want to lower the cardio and bulk up through weight training and diet (i have a bulker in my signature designed for guys like you) at your height you can easily get close to 200 naturally IF that is what you want to do.