Recently bought my E53 X5 3.0D and absolutely loving it

I will be needing two rear tyres soon and wondering what to go for...
Do most people avoid run flats on the X5? I don't particularly want run flats if standard tyres will be fine.
I think the tracking needs doing as the rears are wearing more on the insides. Is it an easy fix?
Naturally I don't want to spend a fortune, but at the same time I want something reasonable.
Cheers for any help
