I'm in the same boat, but I reckon a new F15 looks way better value. Xenons, Pro Nav, etc all standard now, its quicker, better CO2 and MPG, and a bit roomier. Plus loads more tech e.g. Msport includes Dynamic Damper Control, and rear air suspension as standard. Adaptive lights with HBA are now only £450.

Looking at AUC a nearly new E70 3.0d msport is coming in at just under £50k. A similar spec F15 is a couple of thousand more.

Not sure how realistic they are, but ukcardiscount and coast2coast cars are offering around 10% off the price of a new F15 (3.0d) with options available for configuration.

Interestingly if you price up an LCI 530d msport with the same spec as a standard F15 3.0d msport, there's practically nothing in it, which makes the F15 relatively good value.