I'm going in a different direction.
I'm going to overlook steady eddie Matty Smith and pick Danny McGuire. I think McGuire, more so than any other half in SL, plays with his head up and quickly assesses what he sees to his advantage. Chances against the Aussies will be few and far between an I want some one who, the moment there's a slip up on the oppositions behalf, wil take full advantage. An under rated player, imo.
You'll lose a bit on the kicking and organising game, but I believe Widdop will bring that with him.
I've gone for Brown in reserve. Ratchford seems to be more popular currently but as a HALF, I think Brown's just got it.