I can't say. I haven't played any of them before (besides the Ice Climbers VC demo on Smash Bros Brawl).

I want to say Eternal Darkness but I'd be lying to myself if I didn't say Earthbound.

Earthbound.

Eternal Darkness or Earthbound would help round out their core offerings. I think Golden Sun would be good too to further expand their RPG offerings.

But frankly Nintendo also needs to just better handle some of their more core gamer IP. Frankly, I don't get what their deal is with F-Zero, Star Fox, and Paper Mario. In every other great franchise they always experiment but with level design, mechanics, etc with few exceptions. But these three they feel that unless they can reinvent them they've failed miserably, all the while ignoring obvious possible improvements and expansions they could make. It's really bizarre.

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I could see them making Ice Climbers into a 2D or even 3D platformer. and the two ice climbers would make it great for Co-op play

Eternal Darkness.

Eternal Darkness cause its the only survival horror game Nintendo has ever published

Hmm, I'll take star tropics.

Not very confident a new Eternal Darkness would be good, I feel I've had enough with Earthbound and I'll close it with the fanmade 4 game, and the other ones I don'r care much for.

Can I choose Duck Hunt and Mysterious Murasame Castle instead?