I would certainly think about the waterpump and thermostat really soon as that will leave you on the road dead. On my E90 it failed at 105k, which is typical. I would also have the tranny drained and refilled if it were my car. I believe there is an integral filter to the pan that gets swapped and drives the cost up. Prices quoted are on the high(ish) side, my local BMW dealer doesn't charge *quite* that much, and an Indy would charge less still - $950-$1100 for the waterpump /thermostat. The waterpump alone is $400+.
I recently got a quote from the dealer for spark plugs and coils and octane adaptations reset for $700. I would have those other items inspected and done "on condition" I doubt everything on that list needs done immediately - just chip away a little at a time.
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