sensible mileage with 5 to 8k.!!!!!! The best ones start at 10k, or you're looking at galactic mileage motors, or TD5's with little or no service history. I paid 10k for my 2001 TD5 auto, with the dvd system thrown in, only had 29,000 on the clock with 1 owner with a service record of a major service every year.
All I can advise is the TD5 is the mutts, but check it well, very well. Got to be inspected, and good luck. With you're money range the 300 series is much better for you