FWIW, I bought a Toyota ('08 Lexus GX470) because I wanted a relatively maintenance free/bulletproof vehicle. The 4.7 has legendary reliability. Since I bought it a few years ago, I've had to replace two wheel bearings, both exhaust manifolds, the entire exhaust (literally), power steering rack, passenger side driveshaft, both front brake calipers, rear height sensors, rear control arm, clock spring, HVAC fan, and I'm sure I'm missing something. I just put $1,500 worth of brakes on it and I'll be dumping another ~$1k into it for a timing belt and water pump in the summer. Granted, some of those were preventative maintenance and none of those problems would have left me stranded like a head gasket or slipped piston ring in the LR, but my point is older vehicles come with their fair share of maintenance regardless of make.
If you have your heart set on a Disco II and you're aware of the potential problems going in, I say go for it!