Ok. Currently I am jungling with Shaco and using a perfect build which is op. I just wanted to try out another champion and these are my top 3 candidates.
nocturne literally the only non-cancer champ on your list
Lee Sin is probably the strongest and most popular pick, Nocturne being less popular but still very good and rising in popularity lately, with Wukong being the least of all them (though still good).
Basically just pick which one you feel is the most interesting or more your style. I prefer Nocturne.
You might be interested in watching Nightblue3's Twitch stream. He teaches jungling. It's much better to watch them than take my word for it, but having fun with what you choose is the most important thing.
Master yi and the new devourer are really op. maybe also try warwick he easy. xin zhao is a really easy champ to carry with.
Don't take this the wrong way but, not Lee-Sin. If you are level 16, still learning, etc. it's probably not a great idea to play Lee-Sin. A lot of Lee-Sin's power comes from abusing certain aspects of his kit using techniques that are not user friendly and he's is generally not recommended.
Side note: I believe that it's better to try out some of the rotation champions you can play for free rather than buying a champ to try them out. 
& 
are two "Jungle ready" champions on the current rotation you can take for a test drive.
