You should have no issue finding a tidy e39 at the higher end of your budget

Sport Tourings are scarce extremely scarce so uk is probably the only option for them

Have you an engine in mind ? Diesel petrol i6 v8 manual auto

Actually there is one e39 which id buy at the moment its the only one thats caught my eye lately il dig out a link

Edit: http://www.adverts.ie/5354573