Any games you fancy playing on the 3DS if not I'd sell it, maybe wait for a hardware revision?
I'd be tempted to sell it. I've heard nothing but bad things about the 3DS and other than the old N64 remakes I'm not sure there is much on there to keep you interested. The recent massive price drop should indicate how well the 3DS is currently doing.
I would say if your gonna sell it, do it sooner rather than later,
Nintendo products tend to be top price only for a few months or til they hit a certain margin, then the price plummets.
Look at the N64, was £249 in the UK @ launch for 6 weeks, then went down to £149 and everyone went ballistic lol
I remember a similar story with the Wii
Sell it to a mate, then you can try it when they buy it
Congrats on the win either way