Mine is a 2006 TD4 Manual.
I bought it for £8,500 in June 2012 with 40K miles on the clock. Apart from consumables and mods (limited though they are) I've replaced the tyres, LP fuel pump, the MAF sensor (at the same time as the fuel pump) possibly unnecessarily, the thermostat, track rod ends and the drop links. It's currently on 75K miles and running well.
The information I've gained from this site has given me the insight to anticipate what might go wrong, what will go wrong and what has gone wrong. I don't get so much of the last category since paying attention to the first two means I carry out preventative maintenance and have, so far at least, avoided any major issues.