It's no doubt just dumb luck, but the Brumbies have had a week off to freshen up before both NSW games this year. Most teams coming back from the bye this year seem to have gone pretty well, so I think this will be to the Brumbies advantage.
Foley appears to be suffering some fatigue - given the minutes he has played this is not surprising, but I am not sure I would have Barnes starting in this one either. I would start Mitchell so as to give us the most options on kick receipt as I expect the Brumbies to continue their aerial bombardment. For a team with a supposedly brilliant backline, they don't use it much.
I hope they appoint a top-flight ref for this game, the breakdown is going to be very willing and if someone like Jackson gets it the game will turn into another Reds-Brumbies nightmare. For the sake of a good spectacle, I hope the breakdown and the offside line in defence are well policed.