Don't disregard the modern stuff until you've actually driven one of them. Admittedly, you can't fix them with a box of spanners and a hammer anymore, but name a modern vehicle that you can. With the right tools any vehicle can be maintained by anyone with some mechanical sense. While there's not much you can do if the engine management fails miles from anywhere, exactly the same is true of a mechanical injection pump.
The current Discovery is very much designed to go anywhere and do just about anything you'd ask of a 'proper' landy.