Agree with Opti, Td4 is within your budget & is good (especially auto)
Petrol is best avoided due to head gasket failure (design flaws)
Early L-series diesel is good, simple unit but slower than Td4 with a cambelt to change & the earlier higher stressed IRD.
Td4 is more complicated but fairly reliable apart from some sensors & ancillaries but has camchain, better performance/economy & redesigned sturdier IRD.
Whichever diesel you go for it would be wise to save a couple of hundred quid for the odd issue & read up on here what to look for on each model.
All Landrovers require regular maintenance & spannering to keep them running well & the Freelander is no exception. It'll take a little more looking after than one of the japanese offerings but they are far superior from a handling/ride point of view & once you fit a roverron synergy tuning box with egr bypass for less than £250 they have pretty good performance too for a 4 wheel drive. They are exceptional in the snow & the hill descent mode is superb going down icy hills.