Arent there gearbox issues with the earlier ones that use a rangey box?
Nice motors,4.4is rapid but thirsty as hell,derv good but more pricey.
We have a merc ml 270cdi which is great but hasn't been without its issues,nice smooth drive but not as sporty as the x5.
Toyota/Lexus rx300 are nice,plenty for your money or even a toureg although they have a few shitty problems too.
You do feel safe driving them but in reality i doubt their much better than a modern car.
Merc cls are nice,could get a 500 for your budget,thirsty but quick and reliable.