If you go for a 2005, make sure it has the upgraded MOSt system satnav with touch screen.
As hippo says, go for a TDV8 as the engine is far superior to the TD6. However, if only low miles per year anticipated, go for a nice 2006 Jag built 4.4 V8 petrol. note, however, only the BMW 4.4 V8 is...