Although I really don't like Willow/Kennedy either (come on... there just are SO MANY better alternatives for Will *gg*), I had to go for Bangel on this one. If I had to hear our favorite vampire gasp an emotional, breathless "Buffy...." just one more time, I would feel compelled to throw heavy objects at the screen. For me, this even ruins the otherwise great moment in "Becoming".
And no, I didn't vote Cordonnor. It wasn't healthy, sure... but Cordy wasn't herself at the time, and it's not nearly as Freudian for Connor as it might seem at first glance, seeing as he never grew up with Cordy as surrogate mother... if you want to take an oedipal spin on it, it's clearly closer to the original, pre-Freudian story - falling in love with the mother he doesn't know she was, and tragedy ensues.
Given his "skipped" growing up - at least in our dimension - there really can't be a psychological incest block between them.
As an aside: What is it with TV shows doing this skip? I mean, the Whedonverse has Connor... Xena did it ad nauseam, and it even happens on Trek, though a little more subtly (the infamous "off-screen-growing spurts" of Alexander Rozhenko, Naomi Wildman and Molly O'Brien - though, in the latter case they toyed with doing the "full skip" on the latter for only one ep and reversed it at the end of the show....)