I think we've posted about the 185 package before. If you look at the power and torque charts the 185 looses out on the 165 in the low end of the rev range. As you pointed out, its the cams that do it.

So, for 'real world' driving I have always rated the 165 kit as a better balance but could imagine that the 185, when on the boil hammering down a B-road must be a lot of fun