we usually do 4to6 6X9s and 2 12s in most of the boats we do. Most people are very happy with this set up and you can usually get this done relatively inexpensive. As far as recomendations we usually use Eclipse 6x9s (retail $179 pair) they work very well for marine use. as far as woofers we usually use either Rockford or JL audio (starting @ $109 ea) For amplifiers we use Rockford or JL amps (depending on budget) I could definitely help you out if you are interested, you could also contact ROZ, he also hooks up ***boat forum members.