Well having got right by the stage at V to see them (though masturbating in such a crowd wasn't easy haha) and seeing them in the flesh I have to say the order is-
1. Kimberley (nice womanly figure, cracking shapely hips)
2. Nicola (yes, in the flesh she just oozes sex)
3. Nadine (despite being overmade up, but great figure)
4. Cheryl (far too thin and looks false
5. Sarah (just looks skanky, underfed and old)
A mate of mine met them in a club in London and he insists that close up, ie meeting them, Nicola is stunning.