Ferguson is my all time hero. Even more than anyone in the 80's side. Cahill was probably my favourite under moyes. But for someone who remembers when we really were good I'd have to say arteta cause he really did have ability but just didn't play in a very good team. Plus most of the time he played out of position so didn't shine as much as he could have.
Gravesen anyone? Cahill, Arteta and Pienaar are up there obviously but Baines (especially after likely knocking back a transfer) might have to take it.