I would say it breaks down to something like this:
Centre
Gretzky
Lemieux
*pretty much consensus positioning, but some put Mario on top
Beliveau
*again, pretty much consensus
Morenz
Mikita
Esposito
Messier
* most would go Morenz then Mikita, but some might switch, and Espo and Messier might make it onto a few lists
Wingers:
Howe
* hard to argue for anyone else
Hull
Richard
* consensus 2-3, but lots of debate on the order
Lafleur
Jagr
Bossy
* there's some legitimate debate between how the three rank, though Lafleur seems to be considered the best. I don't think there's really much argument for anyone else
Defense:
Orr
* no debate really
Harvey
Shore
* consensus 2-3, but lots of debate on the order
Bourque
* pretty much consensus 4
Lidstrom
Potvin
*the usual 5-6 in some order, though Lidstrom probably has more support. The odd person might add Kelly or Robinson
Goaltenders:
Hasek
Plante
Roy
*basically the consensus top 3, though some might add guys from the next group, and there's lots of debate on the order here
Brodeur
Sawchuk
Hall
Dryden
*again, lots of debate on the order here, and some people might put these guys into the above list, but there isn't really anyone outside of these top 7, unless someone really feels strongly about Tretiak