I've given up trying to get this information from dell.co.uk. I guessed I was getting nowhere with Dell sales when the salesperson told me 'not to worry about the external video cable, any will do'. Hmmmm.
Anyway, I'm aiming to buy the x50v, GPS (Dell bluetooth GPS, car cradle & charger, s/w) and the video cable. However, buying the x50+GPS bundle doesn't include an option for the video cable (and it doesn't seem to be available as an accessory). And buying all the GPS stuff separately seems to cost an extra £400

.
Anyone managed this feat of dexterity without remortgaging the family home? As the Dell website says 'At Dell you can be safe in the knowledge that you get just what you order, customised for your needs'.
Cheers,
Mark