in my opinion both the later td5 disco and the p38 are crap....
ive had a few of both, and all were breaking down left right and centre... the p38's ive had have all been 4.6 models....
all of these modern landy products have to many issues with them.. the only real range-rover is a classic and the best landy engines of all time are 200 and 300 tdi's
youd be better off buying a 300 tdi or a fourtrak or similar just for your off-roading
p.s hjeres my old vogue best its got a 5 inch lift and a humvee 6.2 v8 disel........... now this is a BEAST