Thanks for the responses guys.
I have the similar feeling when it comes to the mileage, I've never had the experience but there are people who say cars can be great for well over 100,000 miles if looked after, I can't help but think that's too many.
As for one feeling right, it's hard when they look great appearance wise. I went to view a red jdt, 88,000 miles, at the weekend, it looked very nice and I wanted it, I had to go away and calm down. It had no service history and the oil was like tar.
I've found another diesel with 112,000 miles it looks well looked after in the pics and apparently has full service history. In theory this should be a more reliable option, shouldn't it?
I can't help but let the mileage deter me :S