Just get an Eclipse Double DIN NAVI. It literally plugs right in. And it will retain your stearing wheel controls (If equipped).:thumbup:
But if you want to keep your stock then an LOC will be fine. LOC's dont sound as good as an actual pre-amp output, but they are not that bad for sub applications. Just dont go overboard with the bass. If you do, then you will need to amplify your interior speakers as well, and It's the 4 channel LOC's that sound like Doo Doo.