I got a pioneer MARINE CD/AM/FM (from the boating section of Cabella's; I'm sure that they're also at Bass Pro shop, etc), and got some surface mount 5" Marine speakers for the front (may go to floor, dash, can be taken apart from the mounts for mounting behind a different grill). Getting a MARINE amp (again, from boating supply source), and got Bose 151's for the rear (yeah, maybe should'a got 161's).
Designing a tread-brite / expanded steel outer-box for the Boses, and will mount them at one of the junctions of the roll bar (Less wattage in the 151 than the 161, but, will make up for it in size & placement location). The Mount will allow the speakers to be rotated out / rear (for tunes outside the vehicle while relaxing), but still protect against theft. (No, no pic's yet) The point to the whole design is: waterproof, with sound quality.
For those that don't know - the Bose 151 & 161 are both waterproof (they display them in a huge fish tank at the stores, and you CAN hear the music from them through the water and tank wall (barely)). They HAVE been available through Sams club / Costco, but, the reality of Bose is, no matter where you get them (including outlet stores), the price may go up, but, it don't go down.