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I'm absolutely getting Cave Story 3D! Though, to be honest, it does feel a little lame that the first three games I'll probably own for the 3DS will be games I've already played extensively in years past (OoT, Star Fox 64, and Cave Story).
If it was a toss up between paying for CS3D, and paying for a 3DS to play the game, then I would get CS3D. Just owning CS in a physical medium is amazing enough in itself, being able to play it is just icing on the cake.