We have a 89 FJ62 Landcruiser for sale, its a two owner 159000km car thats hardly ever been off road, 3F petrol motor, bar work, good Reese hitch, chrome rims etc.... we bought it for off road driving which we never got the chance to do. We bought it after being told that the 62 series were better on juice and offroad then the 80 series, were more up to date that the 60 series and were the last of the pre-electronical nightmare cars to come out - I'd like to see someone fix a 80 series in the bush with minimal tools like they would to a 62 series.
It is an excellent car off road in the times we took it off road, will do beaches etc. easy and rutty tracks quite easily.
However, the HiLux is considered a better vehicle off road with a lift kit, 33" or 35" tyres and some air locker diffs, however people tend to steer away from them because they are prone to rolling - being such as narrow car and all.
The Suzuki Sierras are awesome cars off road, especially with a lift kit and meaty tyres. They are so light, they will get down tracks that bigger 4wds would have no hope on, and when you perform a turbo/engine swap or preferably both, I would presume they would go alot better off road. These really are better cars because not only they are better in the bush, but more economical and cheaper to buy as well.
Also, supposably Patrols are better off road than Landcruisers.
Unless you have 4WD experience, buy a boonger first than upgrade, it will save you a hell of a lot of hassle when you damage the car.
If you are going to do some lesser offroading, just buy a 2WD dual cab ute (Rodeo, Hilux) and whack some 4by tyres on it - my mate did it and his car is awesome to drift in the mud - the only reason he likes 4wding.