You may want to check out this nav buyers guide from caraudiomag.com. Most of the systems there are probably going to run you more than $1200 though. Definately check ebay as you can get some decent deals. I did some quick looking and for that price you might be able to go with the Kenwood kvt-617dvd (which is the screen I just put in) and the kenwood nav module (KNA-G510).
Hey Kevin: I have a 6 disc cd changer/navigational unit with a 5 inch screen. Would you be interested in buying it? I could let you have it for less than half the price mentioned above... email or respond if you're interested. Peace.