Disco 2. But buy carefully - look for good condition, lots of history, and a car that looks and feels "right". Takes time but worthwhile in the end Lookout for rust - bodywork on D1, chassis on D2. If DIY is your thing then a TDi is the way to go, but the D2 is still in the realm of real world mechanics - only just, as you will need a diagnostic computer.
Either way, again go for the best condition and history you can find / afford and you won't be sorry. The Disco is lovely Landrover.