If I am wakeboarding, how many watts do I need in two tower speakers to clearly hear the music. What are good semi expensive speaker brands, and what size amp for the set up. I don't want to install big speakers to avoid dents in my forhead, is it possible to get good sound from 6 inchers. If not, what do I do. Any help please. I was looking on e-bay and saw some 6 inch rokford fosgates 250 amp each for around $230. (am I getting what I pay for?) Thanks Bart