Off road, the V6 certainly holds it own compared to the V8. It's more in tune with the tranny, and has a fantastically flat torque curve. It performs superbly off road, and might even give you slightly better range. Basically, don't let the engine be the deciding factor. I also agree that the locking rear diff is nice, but I too would not let that be the deciding factor. The traction control is phenomenal, and the locker makes certain obstacles easier, but a non-locker equipped LR3 can do all the same obstacles due to its traction control. I have considerable off road experience in both locked and non-locked versions, and have never failed an obstacle in one over the other. Ever.
The add you linked to is way over priced. For a 2006, you are looking at about $15-18k for a nice clean one under 100,000 miles. These are great rigs, supremely versatile, with outstanding cargo space and passenger comfort. However, they are a bit pricey to repair when you ding them up off road :-)
I wrote an article on shopping for a used LR3 a while back. It's a bit out of date, but still might be useful:
Good luck in your search!
Off Road Photography: www.nwoods.smugmug.com
Yeah, the maintenance on these land Rovers are expensive. I have a 2008 bought brand new with 50k miles and so far had to pay for front brake pads and two oil changes. It's killing me.
of course, the D1 was a different story.
'08 Land Rover LR3
'05 Subaru Outback
'96 Land Rover Discovery I (sold)
'80 VW Westy
Yes, Nathan, that is your trusty rig in the photo. Kevin has definitely used it for what it was built for. The last Death Valley trip, he ripped off the side of the front bumper pretty good, but was able to get it back in shape on the trail. One of the downsides of the coils was more evident on our last trip when fully loaded, with water/gas/rooftop tent, etc. With the coils, his ground clearance was definitely more limited with all the weight. The air suspension LR3s had much more clearance. lBut it still made it up some difficult obstacles and looked good doing it...None of the LR3s had the heavy duty package, but if you can find it, I would go for it.
2001 Range Rover 4.6L SE (SD rack, ladder, Warn xd9000ce, steering guard, axle guard, diff guard, sliders, coils, 33in KM2s... no chrome)
2003 4Runner 4.7L V8 (wife's)
1985 E30S52 (1985 318i w/ 1998 M3 drivetrain, OBDI and 5-lug conversion)
Far better it is to dare mighty things...even though checkered by failure, than to rank with those timid spirits who neither enjoy nor suffer much because they live in the gray twilight that knows not victory nor defeat. - theodore roosevelt
I think Cahoots ding-dong-ditched us.