So here's what I'm doing with my audio system. Going for more of a budget install.
Pyle mechless marine head unit with protective case ($80)
Pyle PLMRA400 (4x100w) marine amp ($60)
*2 channels split to run the front and rear full range speakers
*2 channels dedicated to the 8" subs under the seats
-installing an 8" Pyle PLMRW8 Hyrda Marine sub ($30/ea) with XTC waterproof speaker baffles under each seat. The speaker baffles will keep mud and debris from getting into the subs speaker basket.
-installing two Pyle PLMR63 6.5" waterproof speakers ($45/pair) in the rear bed. Corner mounting them in the front corners of the bed facing the rear seat for the passengers.
-installing two Pyle PLMR66W 5" marine waterproof speakers under the dash facing the front seats. ($87/pair)
Total System Cost: $332