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Sell it. Especially consider 3DS's are locked to an account. Unless I have multiple special editons there's no point. Selling my Red XL since I'm getting the Pikachu one. Leaves me with 3 more transfers
I used to keep 2 DS's at a time, and I had a PSP 2000 and GO at the same time
GT:OmegaXP PSN:SgtWiggles WiiU:SgtWiggles Now Playing: P4A, PS All Stars, Etrian Odyssey 3, Disgaea 4, BB:Extend, Ni No Kuni, MH Tri, Persona 4 Golden
I always keep all my old systems since I often get the urge to play them later on down the road and it's a real pain to have to buy everything again off ebay.
If however, I am upgradeing to a newer version of a system I already own ( 3ds - 3DS XL for example) I will usually either sell the older version to knock down the price of the newer system, or just give the older system to a friend.