For the world cup i would agree with you IF Davies doesn't quite perform beforehand. Otherwise id take out prior, open with davies and put bell to 3 shunting the others down a spot.
My ODI team in a year or twos time assuming certain players continue to develop would be: Davies-Strauss-Bell-KP-Morgan-Prior/Collingwood-Bresnan-Rashid-Broad-Anderson-Tremlett/Finn/Shazad
I can see prior down the order in ODI's, just not up the order. I think Davies is good enough to be given a gig in the T20 and a chance in ODI, if he doesnt come good just yet prior can always come back in for the world cup.