few things you missed about the nook
1- micro usb -normal one WILL charge the nook tablet, just in trickle mode- ie takes a lot longer, it will work though, how do i know, because i have done it.
2- if amazon prime is the key factor between the nook and the fire,,,get the nook tablet, it WILL run the amazon video player app fine, it WILL install amazon marketplace, and the kindle app, HOWEVER, you need a microsd card install on the tablet to work with the amazon apps
i have the nook tablet, i have amazon market installed, i have amazon's video player installed, i use the amazon market to buy almost all of my apps due to the pricing and selection is better than the nook app market. i also have gmail installed, google maps, android market, dolphin hd (sideloaded that android market place says it is not compatible...)
video plays better on the nook, it is smoother framerate wise, with my 16gig microsd card i can install 15 or 16 movies and play them no problem (i am in the process of ripping all my dvd's to the computer in .mkv format) the only thing it will not play that i have found so far is bluray rips because they end up too large.
for the 50 dollars -to me- and being able to do everthing the fire can do, just better, to me was worth the 20 dollars more it ended up costing me (i got the nook tablet for 199.99 due to using a gift card)