Man a mini Nintendo64 would be interesting but I grew with many Rareware games that I am sure I'd miss a lot, still, it would be interesting having a properly licensed N64 controller you could adapt.
As for the NES/SNES it is like you said. I ended up checking out modifiers for one of them to 'enrich' the experience. It is pretty inetresting what people have managed to emulate through it.