Also check out the Dual XDVDN9131 ( $269.99 ) at
Dual XDVDN9131 In-Dash 7" Touchscreen TFT-LCD Monitor with Built-

seems to have all the features you want without having to buy add-ons.
( nav, bluetooth, input for rear view camera etc. )
Reviews are pretty good too, but I would also get the 3 year extended warranty for $32.99