What would it be? Since it's only one item, it would be more for sentimentality than anything else if we're talking non-dedicated consoles since a system without a game or vice versa wouldnt be much fun to play. Anyway, if you only could keep one thing, what would it be?

I'd keep my original NES. Just looking at it brings back so many good memories, how when I first saw a display in K Mart, how I used to dream about owning one, the first time I played SMB....there are too many memories wrapped up in that gray box for me to keep anything else.