I am in the Marine Audio business.........
JL generally regarded as best in class, but VERY expensive. MTX makes an OK product.
You should look into FUSION. http://www.fusionelectronics.com/north- ... oduct.aspx
7' model MSFR702 is VERY efficient, and very smooth sounding, not real expensive. Much more bass response than most marine speakers. If you tell me where you live I can recommend a dealer for these and other good products.