I've been going through my collection for variants while cataloging it. I'm already up to 1k+ on my list and I've still got a ton of stuff to submit to the RFGeneration DB for variants. I will say that variant collecting and documenting is definitely a daunting task.

For instance, the latest variant I found was a box variant for the NES Miracle Piano! One box has a sticker on it (rebranded PC Miracle Piano box) and one box has a printed NES Seal of Quality on it (Oval Seal). WTF?! The NES has way too many variants. It looks like the ColecoVision does too...