I know that this topic has been discussed plenty, but what is the consensus on the best (coverage and price) extended warranty to purchase when you AREN'T the original owner of your car. I still have over a year and 13,000 miles left on the factory warranty, but want to buy an extended warranty to 6 years 100,000 miles and I understand BMW only sells the factory extension to the original purchaser. Also, are there any that BMW prefers over others? Thanks!