I am considering upgrading to a Nav. unit. I already have the Bose pkg. as well as the rear DVD Ent. Pkg. I was considering getting an OEM unit that will be programmed and unlocked by the Ebay seller who sells quite abit of the Nav. units. Is there a Decent OEM looking unit That i should also consider? I am looking for the most compatible, easy plug and play unit and not a Flip out type. Thanks.