For the scenario the OP mentioned (excellent offroad performance, combined with good road manners and luxury saloon comfort), there are only 2 real choices - Range Rover and G Wagen. It's worth saying though, that anything can get stuck in snow and ice if it's running performance road tyres of the type usually seen on both the RR & GW. If you want to be sure of getting out of the highland snow, what you need is something with a ladder chassis, live axles, locking differentials, a 2" suspension lift, but most importantly, some big-bottom knobbly tyres and a set of chains in the boot as well as sand ladders, a high lift jack and a winch!
For this reason, if money was no object, I'd be going for a customised Range Rover...
Basically a fast, comfortable, warm, posh Defender.
But a RR with stock road tyres ...or anything with road tyres and....
[video=youtube;K053KWIEcL8]http://www.youtube.com/watch?v=K053KWIEcL8[/video]
...you're only marginally better off than a Ford Fiesta.