If you really want to use the trademark "Amiga" it's legally available to register here...
Click on "Basic Word Mark Search (New User) "
then enter the word "amiga"
then see item number 17... 
(sorry but whomever made that crappy site doesn't allow direct links to the results page, so you have to follow the above instructions...
)
Amiga Tradmarks Live & Dead
But does anyone really want to go to the expense of owning it... 
You would have to ask those directly who already contacted Pluritas, but surely NDA covers not discussing such things.
#6