Hey CJMCG
It seems in this part of world people love to own two or more car for different purposes. Asking on landie forum for other brands will always be biased , no offence to Doc or my advises.
I am doing regular off roading here in Dubai, and i can bet i have not seen much US (other than Jeep) or UK cars in desert here. Japanese rules big time. I dont mean to point for LC which is safari guys donkey cart due to cheap maintenance.
Few cars i own for offroad:
Land Crusier: Big disappointment for good off road capabilities unless you like to do sand cruising ONLY. Damn reliable, cheap maintenance with high resale value.
Nissan Patrol (SWB): It was amazing for off-road with good grunt and respect but limited climb capabilities.
Discovery: Same like LC, slightly better due to smarter gear ratio.
Pajero (SWB): Overall quite happy since almost two years now and plan to keep it for long.
Few Cars i own for road (Comfort and safety wise):
Discovery: Super sliky V8 that you will love on road.
Mercedes ML500: F.fast, responsive and most fuel economical V8 i have ever owned plus decent comfort and safety.
Range Rover: Nothing comes closer to its class, status, respect, comfort and power. I give more marks to RR than my Lexus GS430 comparing its a luxury sedan still.
Few comments about your choices:
Armada: dont even think of taking to offroad as Doc mentioned you will break more parts and bumper than driving.
Hummer H2: Good, capable off road vehicle but being so heavy you need to remember its 3.2 tonnes weight before jumping over a smallest dune. My colleague broke its shock absorber on its first off road drive over a small unintentional jump. Took us 3 hours to recover it out of the dunes. Maintenance cost i have no idea.
Xterra: Very good off road car and successful due to good value for money, road comfort is decent but not great.
Patrol (LWB): New model i dont know, Old Vtec 4.8 is beast on off-road and super safari option is equally good and comfy on road.
Prado 4.0 (LWB): Amazing off road performance but being a soft car, regular bashing is not advisable. Its more of road car than off road.
Prado 4.0 (SWB): Nothing better than this for offroad having 262 hp sitting on 1.7 ton car. Give a two inch lift and off you go over highly modified jeeps and landies in desert.
If you have a budget of 150k ( i assume if you aim for RR-S), then get 2006 RR (Autobiography or Vogue) for 100k and spend 50 on SWB Prado (4.0). To have best of both the world. Two cars is always better than one to serve backup for each other.