I usually don't get into the prediction game with Saimoe competitions, but I'm going to predict a Nyaruko victory in the hopes of jinxing it.
No offense to Nyaruko, but as a big Saki fan, my preference would definitely be either of the two Saki girls.
And in all seriousness, I really think this could be a very nasty split for Saki allowing Nyaruko to come up the middle and take it. I could definitely see Ryuuka's supporters being pretty hard votes - Many of them probably aren't just fans of Saki, but are also big fans of the Toko-Ryuuka pairing in particular. I'm not sure if they'd be willing to abandon Ryuuka to support Kuro (while they likely would support Kuro against almost anybody else).
Plus, Saki faction voters haven't struck me as being particularly well-organized in this tournament. What I mean by that is that I haven't seen much evidence of them trying to snipe the top competitors, or "play" J-SaiMoe in general. For good or for ill, they seem to be voting with their heart.