S. Florida suburbs lure the makers of hip-hop From Miami Beach to Miramar, homegrown producers are laying down the tracks for the future of hip-hop. Liberty City's Martin Luther King Boulevard isn't the only local road to the future sounds of hip-hop. Head west on Miramar Parkway about as far as you can before hitting swamp. Then turn into one of the many cookie-cutter gated communities that are the American dream, suburban sprawl style. If you're lucky, along with the SUVs, you'll find a van whose sides are emblazoned with the grinning metal-teethed mug of ``Dirt Bag.'' This urban promotional...