Citreon Berlingo, or Peugeot Partner vans (same van, only different badging) fall into your price bracket very well, HDi diesel engines are way better than anything else out there, cheap servicing, and very good economy, and bodies that don't go rusty, and an ability cope with starship mileage with ease. Buying one with 150k on the clock should not be seen as a problem, so long as they have a fully backed up service history, these vans can easily cover 500k with no major issues, oil and filter changes are crucial, and should be carried out at the correct intervals, no ifs or buts! they are genuine work horses

Thom