I always find this hard to narrow it down to just a single player. Gahagan, O'Neill, Arnott, Cooper, Russell, Nijholt, O'Donnell and McFadden are some who instantly spring to mind. There will be others if I actually stopped to think about it. I'm not fortunate enough to be able to say I saw the likes of Wark, Pettigrew, Graham, etc in the flesh.
That said, the player I always settle on is the man who showed us that even clumsy big awkward fuggers can be club greats.... Stevie Kirk. In my eyes, he's a legend.