Well I am a PCE person now, but I go back to the Famicom every once in a red moon.
If you can find a cheap NES system then get that and get a converter, that covers most famicom game, usage. Get a real famicom and reversal converter, if you want the extra features the famicom was built with.
The famicom/NES has tons of games that out weigh almost ever other console on the planet, while most are meant for children, the system is pretty nice. Most of the games plays like a Gameboy game, but in color with a bigger screen ( and thus smaller sprites ).
Duck Hunt ( for the obvious reason ) for the NES
Mario 3
Megaman
Battletoads ( exact same Battles for DKC 1-3 )
Dragon Warrior/Quest
BomberKing
If you just want something to play around with for quick fun, then get one of those 55 in one carts, because Game and watch games is where the famicom shines.
Disk system is just their for show, I have a couple of disc system games. Most games on the NES are great,
for quick fun. Basically an Atari but with love inside.