This is a tough choice actually, I think I'm going to hold off on voting for now.
It has been a while since last I played Super Mario World or Super Mario RPG, I wouldn't mind revisiting either one.
I've never played ActRaiser, Legend of the Mystical Ninja, or any of the Donkey Kong Country games but I've heard good things about them and this would be a good excuse to try them. The problem with Donkey Kong Country 2 is that I'd want to play the games in order... so I'd have to buy all three if that were chosen.
Ogre Battle is not an option for me, I hope it doesn't come to that one...
I just can't decide...