Buying advice sought: X5, lo vs hi miles

[Gillibrand]

I am actively looking for a facelift E53 4.4 V8 X5. I'm in the UK with a budget of up to £7500 for which I hope to get a good vehicle about ten years old. My question is - would it be better to go for a low mileage example ie with my budget, about 60 - 70,000 miles. Or would it be more sensible to go for an example that's done 100,000 miles, by which time several major items will presumably have had to be replaced eg suspension parts etc? I plan to keep the vehicle for about two years, during which time I will be doing about 12,000 miles in total.
Any other general advice about buying would be welcome.
Thank you.