To make up for forgetting to post #3, I made a smexy image and have links in the offical box arts! :D Tomorrow comes #1, you don't want to miss it! :D
Some may disagree for this as my third choice, but I still think of it as one of the best in the NES library. DK Jr's cool, but what really takes the bomb is Donkey Kong, in all its 8-bit glory. It's just missing the second level...What a shame. But anyway, you'll spend hours on this masterpiece, and it's a very good port at that. Jump barrels, flatten fire balls, climb ladders, awesome stuff. But to truly master this game it takes skill, because although the 3 levels repeat endlessley, things don't get easier. Think you have great timing and reflexes, and willing to give yourself a nostalgic blast to the past? Pop in Donkey Kong. Check out JR while you're at it, too.
Some people may have never heard of this one, but this is the prequel to the cult-cl@ssic, Earthbound. Orignally realesed in Japan as "MOTHER," this was planned to be realesed here, as "Earthbound," but after the translation had already been finished, Nintendo decided not to. Years later, Earthbound, for the SNES, was realesed, and people decided to take the rare, leaked cartridge of what would have been Earthbound, and called it "Earthbound Zero." But enough about that. This is my favorite 8-bit RPG, and one of my favorite RPGS of all time. Not as good as Earthbound, but it's REALLY GOOD. The game itself works similar to Pokemon: Walk around a huge world, and go from town to town. However, there is no obvious way to know if you have left a town or if you are still in one. What's annoying about this is that there's a REALLY high chance you can get into battles. Earthbound fixed this, with overworld enemies and the system where you can automatically beat them, but this game is hardcore. So prepare to get in a lot, and I mean a LOT, of battles. This was later in the Famicom's years, so the graphics and sounds are top-notch. All in all, if you're a fan of ****c RPGs, you owe yourself to check this one out, but the real carts are rare, so I suggest emulating it.