I honestly don't know which of those pairings makes me happier. Kaim/Sarah definitely makes the romantic in me very, very happy. Ming/Jansen is just freaking adorable though. I think I find Ming and Jansen sort of fascinating because their personalities have rather a yin-yang effect in a bunch of ways. So many things opposite, except... not actually. Jansen = schemey, Ming = straight-laced, Jansen = flirty, Ming = not so much, etc, but on the other hand, Jansen is more trustworthy than he first appears and Ming has her moments of guile, and Ming is the one to finally take the initative and kiss him and Jansen freaks out. XD;
I still love the scene from early on that went something like "I'm sorry for what I'm about to do *grab* Okay, don't move or the queen gets it!" "...Jansen, you're a thug." "There's a door in the back." "Huhwha?" XD That was the point where I really decided I liked Ming. But I ramble.
Kaim/Sarah is utterly adorable, but not as interesting to analyze.
I haven't decided what I think of non-canon pairings. There actually aren't too many to be played with, given that most of the characters are either in canon relationships or related. Fanfiction.net people seem fond of pairing Jansen with everybody, which makes me kind of sad.