Hi Jon, like you I was thinking of selling my Disco (MPI) but have now decided to hang on to it. I have a funny feeling that good condition Disco's are going to be very sought after in the not too distant future. People are moaning about fuel costs just now but if someone is trying to run a Disco 3 or newish Rangerover, a single repair bill for any one of the complex electronic systems,suspension etc would probably cover a few months of fuel bills in an "old" simple Landy. The main killer of our Disco's is rust so if you have a nice clean one keep it protected and I am sure it will prove worthwhile.
So don't be downhearted - enjoy the V8!!
Cheers
Stan