Ok, here's the deal. I had/have a p6500dvd. My truck got broken into, thieves got nothing, but caused damage trying to get the tv. everything is done except for the new tv(they cracked the 6500). I have been cut a check already, so I can buy from anywhere and i am debating going cheap, middle, or all out. Ebay prices are about $450-500 for the p5700dvd and p4900dvd. $650-700 for the p5900dvd and big ranges from $750-over a grand for avic n2's and n3's. if i get a Navi, the navi will not be hooked up in it because the vehicle is for sale anyways. I will only be using the dvd/tv/cd/radio until i get a new vehicle. so i don;t know if i want to spend the extra money for the navi. should i go cheap with the 5700 or 4900 or should i spend the extra $200 foe the 5900. and how good is the 5900 compared to the n2 and n3(not counting the navi, just the rest of the unit)?