Yes, arsenic concentration in rice is a consideration. However, this is not germaine to the discussion of what constitutes a healthy rice intake from the carbohydrates:fiber ratios.

Edit: arsenic concentrations in rice has more to do with where the rice is geown than the type of rice. For example, I don't buy rice from Arkansas.

I didn't realize only macros were germaine. In that case yes, it is as simple as you make it sound.