I bought my 1st Land-Rover 6 months ago, intending to use it as a 'play day' thing. I've used it every day since, and now have a perfectly good Saab that hasn't been off the drive for 6 months
Mine's a little younger than yours, 1998 300 tdi 5 door xs, but from what little knowledge of the histories that I have I don't think you'll be much less happy than I am.
As a 'Defender man' you'll be particularly impressed with the Discovery's ability to transport your whole body (right elbow included) inside the car!
Happy driving
Gav