Rationale: I used 3500s in my cars for three or four years. The R version was great for my convertible during the day and at dusk I'd swap the harddrive to an S model. No room nor power for a backlight in the R model.
Overall, not enough horsepower on those to do much more than Mp3 and GPS.
Previous discussions of this type:
RR on Fujitsu 3400 Tablet
Fujitsu Stylistic st4110 Tablet PC
Good luck with that.