Well, I think almost all Muscletech products are overpriced and have outragous claims. The majority of people use ON because as you stated, it is cheap and has a great taste.

As far as the protein breakdown, if you think about it ON has more than Nitrotech. Both have about the same scoop size according the the nutritional labels. You are taking 2 scoops to get 40 with Nitrotech while if you took 2 scoops of ON you are getting 46 grams. You can always take double the serving of a protein, I think most people (like me) use more than one of ON in order to get around ~50 grams of protein in their PWO shakes anyhow.

So my recommendation is get the ON protein and just use two scoops in your shakes. Just avoid the Cookies and Cream flavor, that stuff tastes like ass.