Disco vs. Jeep
I've owned a 2004 Disco since new and always rent a 4 door Wrangler when the Disco is in the shop, so I thought I'd chime in. I love my Disco, a lot. It is a GREAT truck, but Land Rover has it's reputation for a reason. The truck has never left me stranded, but I wouldn't want to buy one that didn't have a warranty at least for the first few thousand miles to make sure everything is A-OK. I also wouldn't buy one that didn't have ALL its service records and wasn't thoroughly checked out first (head gasket and front drive shaft u-joints specifically. The front U-joint is non-serviceable, goes out around 70K and costs $1,500 to replace - assuming you replace it before it explodes on you on the highway and launches itself through the transfer case.). I feel, stock-to-stock, the Disco is better off-road than the 4 door Jeep simply for the break-over angle and water crossing (I've had a steady, low-speed bow wave over my hood for significant crossings without even so much as a hiccup), but isn't as good when it comes to approach and departure angle. I have rarely had a problem with approach, but have drug the tow bar several times. The '04 Disco is as capable as a jeep Rubicon in all but the most extreme trails. I am still finding the limits of what mine can do. The Disco can carry more weight and actually tow well (I used to tow my race car with it), not to mention it feels much more solid and enjoyable to drive. The Jeep just feels cheap to me and the interior is not as well thought out. The jeep's ride is much better than I had expected, but is a bit loud (not too much to have a normal conversation on the highway, though) and feels a bit like the body is connected to the frame via Jell-O. I have cruised, fully-loaded for a week-long off-road trip in Colorado at 85 mph for long periods and never felt like the truck couldn't easily handle it, I don't think that I would be able to do that comfortably in a Jeep There is more room with the seats folded down in the Jeep, but that is mostly because there is almost no insulation Which has left me feeling cold even with the heat on. I regularly pull the rear seats out of my Disco and sleep in the back while camping. I'm 5'11" and just fit back there with my 5'6" girlfriend. It is actually really nice and cozy. I don't think I'd want to try that in the Jeep.
I know Jeep doesn't have the best track record with reliability, but I don't know enough to say anything other than I doubt it is worse than Rover. The Rover is extremely stoutly built though. The frame and suspension components are built like a train. The only other normal vehicle I know of that can match the strength of the underlying components on the Disco would be a Land Cruiser (80 and up).
Over all, if I were in a position to buy a new Jeep with the life-time drive train warranty, I would. Otherwise I'd probably buy a well-maintained used 04 Disco with low-miles and and put the rest of the money aside for repairs.