In terms of reliability, is there anything in particular I should look out for?

I read about a temperature sensor and water pump issue. Are there reputable aftermarket warranty providers who will handle this?

This car is intended to be a daily driver. I had an M5 as a daily driver and that was nightmare galore. Hoping not to be walking into the same thing.

Thanks.

I too am shopping for an Extended warranty company and foud these reviews helpful.
Best Extended Car Warranty Services Review 2014

Be aware, of the several I have contact/ reviewed, all of them will not cover a vehicle that has over 150,000 miles.