if u want to only spend $450 on a double din unit with navi you'll never get one. used ones are around $550. one option is to buy a nice touch screen on ebay, only costs about $350 new. then just buy a tom tom navigation thingy or something similar. much easier that way. i have a pioneer double din touchscreen cd/dvd/mp3 fits perfectly in my 02. bought on ebay for $315 new.