It's pretty cool, but yeah, we generally discourage posting videogame remixes around these parts since there's already a good strong community for that (OC) and this is more for making original sounds using chip hardware (even if the songs are not original).
Anyway, I would definitely suggest that you try out different chip music programs if you want to get into making music this way, via emulators, before buying anything. As for midines, it's still possible to get it, but there are also some other tracker programs in the works for NES which might be worth checking out. When it comes to playing live, though, it's easier to play gameboys than NES decks. Also it's worth checking out the newer programs on the DS, like cartridges (DS10, M01), DSiWare (Rytmik, Rhythm Core Alpha), and homebrew (Tonesynth). AND, there's nothing wrong with making fakebit in your favorite DAW, using VSTs like Plogue Chipsounds and Chip32.
So, my point is, there are lots of options!