Easily Edmonton
Gretzky
Lemieux
Crosby
Mcdavid
Messier
Malkin
Francis
Weight
I'd personally have it closer to:
Gretzky/Lemieux
Crosby/McDavid
Messier
Malkin
Francis
Weight
The first tier is obvious, and while I understand if one wants to rank Gretzky first, they're close enough that I can see putting them on a similar tier (sort of like Crosby/McDavid).
The next tier, I think McDavid and Crosby are/will be slightly ahead, followed by Messier (more consistent/less injury prone than Malkin), then Malkin.
I think Francis is on a tier just below those four. Longevity and consistency he keeps pace, but peak play he wasn't as dominant as those four were.
I think Weight brings up the rear, and by quite a gap.
So I'd personally take the Pens foursome, largely because I think the gap between Francis and Weight is bigger than any of the gaps between the top three Oilers and the top three Penguins.