When would you purchase and Extended Warrantee?

[FirstBMW]

I just ordered my 08 X5, scheduled for week 41 and hoping it gets pulled into next week!

Next I need to decide on the Extended Warrentee. I have had my last two cars (Honda then Toyota) for 9 years, so will likely keep this one for a while too, Maybe 80K or so. Those cars were very solid and Maintanance was mimimul. I am a bit nervious that this car may need a bit more 'care'

So the questions:
Should I buy Extended Warrantee now or wait until the Factory Warrantee is almost up?
How about and Extended Maintanance for regular service?
Should I get it from the dealer or from an outside company?
Any other things to consider?

Thanks.