Disco 1's rust like nobodys business. If you want something comfy that rusts away, may I present the the Range Rover Classic, with 3.9 EFI

But stay away from the 2 doors, they're all mine
If its a 2nd or 3rd car (I assume it would be for you Howard) Get a Series, you seem confident enough with a spanner to fix anything on them (If can do it....

) 3's will be the newest yet cheapest, most abundant and be easiest to source parts. 2's can take parts from 3's but most have the added bonus of being tax exempt, however they command more for this. 1's are the best

But are silly money, the 80 being worth even more than the 86 or 88's

90's at <3k will be absolute dogs, owned by those who like to offroad them, but bodge everything when it breaks
Check my
flickr for some RTV photos, much clammer than pay and plays, with nicer people imo, and less chance of you getting too muddy / breaking too much