Monero,
Boolberry,
Aeon
(did i miss anyone?)
Even the largest isn't much to look at right now, but if the world of cryptonote keeps growing then by 2017 these three could really be something together. Competition is good and will keep everyone on their toes, and who knows: if Aeon finds a good niche that requires a separate blockchain, it might even be a long term contender.
DigitalNote?
I find the extreme fast mine and multiple renames more than a bit questionable. It is an interesting coin and the developer has very interesting ideas, and worth a look to make up your own mind, but I wouldn't put it on a "short list".