To replace or..........

Our LHD 2012 X3 2.0 diesel has been fantastic and for our road trips down to Greece is the absolutely perfect car.

Now that it has a little over 100k miles on the clock I was toying with the idea of a newer LHD X3 but the second hand prices are just nuts - I just can't face leaving a twenty five grand car in a Greek side street just waiting for the latest knock or scratch from the careless parkers.

The car has been serviced at main dealer during the five years we have had it - apart from tyres and servicing (OK the ABS sensor) mechanically the car is fine, there is a bit of a whining noise (water pump i believe) but it has always had that and I just don't know how to be rid of it.

My thoughts are to spend a few quid on the car to ensure we get another 2-3 trouble free years service - are there any tips as to what would make sense to replace? Given the abs sensor was a problem I was thinking to replace those - I had the chance to have a good look underneath when the car had the sensor replaced. There is a bit of surface rust on some of the suspension components (but nothing drastic) and I saw a minor weep of oil at the rear diff.

Appreciate any ideas!