I paid £2500 for my 200tdi but any defender for that money will need deep pockets.
I knew mine needed some welding etc but nothing on the scale I found when having a good dig around, 6 k plus later it has a new bulkhead and galvanised chassis, new brakes, suspension, fuel tank, full engine strip down replacing every gasket etc etc and I still have the body to sort out, don't get me wrong it's awesome, I love it mostly for its simplicity.
Had a td5 before hand which was utter ****e, throttle issues, head gasket, oil cooler, rubbish engine so can't recommend that, wouldn't have one given.