Colly or KP. Honestly the only threats in the English lineup. I have no clue what Prior and Bopara are doing in there though. Bopara is a good ODI batsman, but not test quality. And Prior is just terrible. Sure, hundred on debut, etc, but he can't keep and can't score under pressure.
His keeping is poor, but I thought he kept okay in the 1st match. The 2nd statement is wrong though, he was under immense pressure and scored 2 half centuries at the beginning of the series. He'll always find it tough due to the Stewart factor, just like Australia's next keeper will struggle due to the Gilchrist factor.