$840 sounds wrong, are you sure you unchecked include VAT? If you are in the US you don't have to pay VAT. I paid $720.43 USD total.
$250 for the bezel is what they go for unfortunately but Rich is the only source I know of and the bezels are very high quality. I also don't get a good feeling towards the mp3car store. I have inquired about their transflective displays before and their answers are short and not very customer service oriented. I just don't get a sense of professionalism from the company.
I haven't been able to get 800x480 running yet but 800x600 looks really sharp and it's kinda hard to tell that it's not native. I am happy with 800x600 for now.
The LCD cables are very long and almost reached to my laptop in the trunk. I had to get a 6 foot VGA extension unfortunately which is the shortest I could find. All I really need is 12 inches or so. I also have about 6 usb cables all running under the carpet into the center console. You can never have too many usb cables. I suggest running a few extra just in case so you don't have to run more later. I also ran a cable with some extra wires that I used for remote on for the amp, 5 volt power front the trunk, laptop power switch, whatever.