People always fight over these things (and tend to diminish the achievements of those they dislike). I think, a) we have to limit it to media success, and not try and discuss people who happen to be successful in completely different careers; and b) we have to overlook the fact that some media projects have been rubbish. I which case I will make a stab at putting them in order. (And I am inclined to treat Eire as if it was the UK even though it is a far smaller market.) I have missed out Deana because I'm not sure she actually gained anything at all by being in BB.
1. Jade
2. Brian Dowling.
3. Craig Phillips.
4. Anna
5. Alison
6. Josie
7. Kate
8. equal, Aisleyne and Nikki, tied together forever.
10. Ok, Sam, though the nature of his fame is a bit different.
11. Chanelle
12. Adele
13. Jon
14. Spencer
15. Sam and Amanda
16. Brian Belo
17. Gerry
18. Benedict
19. Grace
20. Nick.
I've probably missed someone obvious. Still, it's the best I can do for now.