Derv's hold their value pretty well, well enough than the 2.5 turbo Mondeo that comes fully loaded.
I'm taking MK4, had(still got) MK3 TDCI 130, was nice just a tad too problematic with sensors and injectors being a costly repairs (out weighted the price I paid for the car) so ran it til ran out of T&T and can't bloody shift the fecker!!