If Kieswetter makes runs in the warm-up game, then he has to play. Even England aren't stupid enough to leave him out over Prior, who's hardly made a run in ODI's.
I don't see the point in Bresnan being in the side. He averages 42 with the ball and England have a long batting line-up anyway.
I would choose Sidebottom for now, but we need another fast bowler from somewhere.
If the pitch spins, then I would choose Tredwell over Sidebottom.
My side:
Craig Kieswetter (wk)
Alastair Cook (c)
Jonathan Trott
Kevin Pietersen
Paul Collingwood
Eoin Morgan
Luke Wright
Stuart Broad
Greame Swann
Ajmal Shahzad
Ryan Sidebottom (or Tredwell if the pitch turns)