SAME HERE!
What I do is download the nuendo trial (400 hours) to the elicencer and literally use it for opening AAFs. Once they are loaded I save, then load them in cubase. So that 400 hours is going to last me ages!
(Note: coz .npr and .cpr files are interchangeable)
I also downloaded the new 400 hours for nuendo 6.5 which I am keeping untill my nuendo 6 trialw 400 run out. (will last me years since loading an .aaf and saving and quitting takes a couple miniutes)