Hi, I'm newbie maybe i can contribute something here. If you are looking for good quality sound Pionner or Alpine are good head set, better put double din with LCD so you can utilized reverse camera as well you can watch movie or using as GPS. Currently I'm using Alpine W202E as for adapter you can check from ebay much cheaper compare buying from audio shop, as for speaker 2 ways or 3 ways set up you have to decide, you can decide using proccesor or just normal set up. Double Din is more nicer then single din but again is up to your budget.