For real 4WD capability, with generally very good durability, My 1993 80 series VX Sahara Turbo Diesel 4WD is still going strong back in Australia and that's seen lots of hard yakka action. Gone places with that would have smashed a Range Rover to pieces, plus the fuel tanks ( their are two = 135 litres ) gave considerably longer range than any other competitor, for me that was important.
I'd only consider 3 vehicles for durable/serious 4 wheel driving, in order of preference:
A proper landcruiser GX, GXL 4 x 4 ( not a Prado ) preferably the 5.7 litre V8 Diesel ( 10.8litres per 100km )
Nissan Patrol, not sure if these are sold in HK, as I have never seen one here, but pretty similar to the Toyota in its off road capabilities and certainly durability.
Isuzu Trooper, not pretty to look at, but certainly capable off road and generally pretty tough/durable. Should be priced within your price range. If you can get a turbo diesel, you'll benefit greatly due having a lot more torque, not to mention greatly reduced fuel consumption.
You could also consider a Mitsubishi Pajero, but I reckon they've gone a bit light weight over the last decade, not as good as they used to be.
Avoid anything that is European, or you will enjoy massive financial pain the moment a rock smashes something expensive underneath that wasnt properly thought out in the first place, which is why the Uited Nations dont use range rovers out in the Middle East. They use Toyota Landcruisers and Nissan Patrols for good reason.