I'm taking a look at various keywords to focus a website (in production) on and there was one specific term which seemed to be very profittable. The keyword gets a lot of searches regularly yet doesn't have a lot of competition. Now I'm wondering how to determine how profittable the keyword would be with Adsense. There is one tool I checked with (SpyFu - not sure how reliable it is) and the results claimed a rather high approx pay per click but I just want to be sure. Any good tools available to check this?