I have a 110 mile round trip commute and with holidays and business trips taken in to account I end up around 25k pa.
I bought a Gunmetal '55 Z in Sept 05 and changed it last Sept for a spankers TO '57. Returns on average around 28mpg during the week with new tyres every 10-11 months. To be honest I don't see the point in having a decent car and using it only when the temperature goes above 20 degress. Mind you, you should see the state of it at the moment after the ice and crap
Yes, it will get stone chipped to buggery, but a bumper respray is ~£300. You'll also find that the fronts of the the rear wheel arches get chipped too. I had paintshield on my '55 and it was really great, but now too expensive and too few dealers IMO.
My advice would be to got for it - well, what did you expect