Do not buy a petrol, unless it has had the engine modded, buy from a dealer, and ensure you get or buy a warrenty as long as possible.
I have had a v plate TD for 5 years and has the IRD,Viscous coupling and rear window mechanism replaced other than that, various lights on at times but they have dissappeared or been reset, it has just been running costs. We also have a 55 plate TD4 so you can guess how we feel about them. do not take too much notice of some of the guys on here slagging it, the FL is a good bit of kit and is no worse than a lot of high tech vehicles, and considering how many have been sold since 97, you are bound to get a history of faults, try a Ford forum and look at reccurent faults.
For cheaper spares use Ebay or similar, Landrover prices are robbery as are most main dealers, it can reduce prices by up to 50%. In the recent snow, my wife was very pleased to be driving one of ours and was one of the few that actually made it to work at the Hospital every day.