From what I've seen, British and Commonwealth vehicles are all approximately the same in terms of cost. A lot depends on condition, "correctness", model, and spares availability.
Ultimately you need to decide how much you'd be happy paying for a vehicle, and if it comes in under that then you're laughing. That'll probably go out of the window when you see the one you want, but hey, it's worth trying
I put "correctness" in speech marks because it's difficult to tell with limited information saved from the war, and with so many different opinions. Do a bit of research yourself before buying, and talk to the owner about the history. Very little left these days is perfect though, so there will always be things that need some tweaking. Some tweaks are more expensive/difficult than others.
Either way you will end up spending far more than they're worth on maintenance, running, and "I'll get one of those just in case" spares, so keep that in mind when setting your budget.