If its staying in one car, Id say Origin B2..
If you want to be able to move it around, RA2.
RA2s screen is blue tho.. and flashes to red during an alert - the buttons flash too.. (blue).. so it looks really cool driving along - especially at night!
Glad I got the RA2.. one thing which I like about the Origin is, it knows the speed limit - so if you are travelling under it, it dont beep like mad - the RA2 just knows the location.. so even if you are doing 30 in a 60, itll still beep! (Altho, less than 15mph I think, it silences as no speed limit is 15, heh)