If a new 40d is going to be around $145k driveway then I'm not too worried about depreciation on my $105k driveway 2010 sd - the gap is too big and I'll likely swap it out in a year anyway once heat is off the 'newness' of LCI models and bugs are ironed out given all the new parts that 'Rhonda' and her team in the US have been 'assembling' ....
I may even just hold out for next gen X5 and leapfrog the LCI - at the rate BMW are popping out new updates to compete with Audi etc I suspect we'll see the new X5 sooner than expected ...in the meantime I'll enjoy the here and now of my 2010
and who knows - once kids are out of car seats in 3-4 years time I might just dump the SUV gig and get a secondhand 911 S with PDK - they should be down to around $140k by then