A few people touched on it, but it has not really be addressed heads up. Discounting the price, do you want the 15" model for the output potential? A number of people will also suggest the larger driver as less power compression, less driver strain and more coil in the gap more of the time to achieve the same output. So, if money was not a factor, is output your primary issue to address? Then if output and budget in play, a lesser expensive & larger coned sub, that is still high quality is easily with in reach. As Nick mentioned, the Fi X, or as others said the SSA Dcon etc. Maybe what I am getting at is pay less attention to the wattage race, and more on your actual goals.