Here is two 12w6vs vented out of the factory 10" location:
If you go with JL I recommend the 10w6 or 12w6. W7s have tons of output but have a hard time playing tight in boats.
The Wetsounds sub has been getting good reviews on here but I do not have a ton of experience with it.
The Wetsounds WS-420 is going to be like having 2 eqs.. 1 for tower and 1 for interior plus a PA. The design and features of the WS-420 make it perfect for wake boat applications.
Alternatives to the WS-420 that have worked well have been the AudioControl products and the Elcipse EQ1000. These will not give you separate equalization of the tower and interior but will give you fade control, sub level and 8volt preamp.