I swapped the clarions for wet sounds xs-650s last year. Big improvement but you'll likely need to be willing to drill and tap new mounting holes and notch out a relief for the terminals...at least i had to on my cans. Well worth it imo, but i did just leap into the rev410 category. Might want to consider long term goals. If you know you want music clear and plenty audible at the end of the rope, the 6.5 coaxs arent going to cut it and youll end up spending more time and $$$ down the road as i did. However, if all you want is a clean and loud system in the boat and hanging out on the shore and couldnt care how clear it is at the end of the rope, then you are on the most cost effective track imo.