The Greatest Ever debate is always going to be both objective AND subjective. What criteria do you use? If you were basing it on box office takings (as Kevin Nash does, unsurprisingly), then you'd have to say Hogan. Of course though, we all know Hogan sucks.....
On a pure wrestling standpoint, then for me there's nary a fag-paper between HBK, Bret, Angle, and He We Do Not Speak Of. Just down from there you've got the likes of Jericho and Eddie. Austin, Rock, UT, and Foley have to be right up there too, although there you are looking at bringing slightly different reasons into it (not that any of them were slouches in the ring when at their best, far from it).
So yeah, Steve Lombardi for me...