Say that your N900 is being flaky. It is under warranty, and you send it to Nokia for warranty work.

Nokia calls you up and merrily tells you that they have no more N900's and your is buggered. So they are going to send you one of their two 'high-end' phones, either the N8 or the E7.

Which do you choose as a replacement and why?

Not "I'll sell X and buy Z" we all know you can find a N900 somewhere, I'm looking at how either of these phones can compare or function as a replacement to a N900.

...as well, no "I'll wait for the N9" since it is not out as of right now.