Just to let all you folks know who are looking to do partial trades on the High-5, it seems like it may not actually be possible.
There are discussions that buying a mixed cart (games you already own and ones you don't) with the idea of gifting the ones you own may not actually work. Only one person can redeem the code, and if it's you to get your games, then you can't pass it on, thus wasting the other purchases.
There is still some debate as to whether this is the absolute case, but what I've read so far seems to indicate it is so.