I came across both the Pioneer AVIC F910BT and the AVIC X910BT.
They both look exactly the same, (both the hardware and the software), but the X910BT seems to be remarkably cheaper than the F910BT (speaking about eBay).

Who knows if there's a difference?
Note that I'm in The Netherlands, Europe, so perhaps it's like the X910BT can't be used with the European FM radio system or something?
I know that the X910BT comes with the USA/Canada maps for the gps, but that can be fixed with loading the map of Europe (correct me if I'm wrong).