And there was me thinking my next car might be diseasel
DPFs and fuel system issues are nagging doubts... especially given as it needs to be less than five years old 
Another big lazy petrol might still be the way forward 
Neighbours e39 educated me on diseasels. A series of pumps in line to achieve massive fuel pressure to achieve atomisation(?) from the injectors. Each pump is very expensive, as are the injectors as expensive as they are enormous. All to cope with almost 4,500psi fuel pressure.
Now turn that pressure on and off at speeds up to 6000rpm and the shock waves that causes through the system. Like my pipes in my house, turn a tap on and off and it bangs with the water pressure as they are loose in the boxing.Now do that at X000 times a minute and it becomes clear why diesels are such horribly noisy things, very expensive to make them quiet and sellable.
They may do 600miles to the tank, but what's saved in mileage is lost in up keep or selling on to buy new(er).
Add in turbos and dpf's and that tips the scales back to petrol and lpg for me. Unless your doing massive miles a day of course.

As a family run about. Nah! Don't think so.