Yes, I'd agree with what Jud9e says.
With the SPIII Deluxe, you get a beanbag mount (which works surprisingly well), a stick-on dashboard mount which comes with 'removable' or 'permanent' sticky things (I've used the removable item in my car, and the whole thing is rock solid!) and a fag-ash lighter power lead-cum-loudspeaker for the lady's dulcet tones (in English or Italian out of the box, with French and German available on enclosed CD to load in).
The Mapsource CDs come with unlock codes for all of Europe and, as I discovered this week, the Atlantic basemap (less detailed than Mapsource) covers not only Europe but all of Africa too.
The 128MB chip is big enough that on my forthcoming run to the Sahara, I can have turn by turn routing from my front door to Gibraltar and then use the basemap for Morocco.
For my bike, I got GPS Warehouse to throw in an extra powerlead (without speaker) so I could hardwire it and a carry case. A Touratech mount is expensive, but real quality kit.
City Slicker has added to his SPIII a small speaker (a la car telephone) which he has mounted under the rev counter. You could use an ear-piece or, no doubt, wire it into an Autocom.
GFI
Greg