Since I started watching as a kid:
Nev (Greatest)
Coleman (Still can't believe how he has turned out, cheap as chips now a club legend)
Jagielka (Loved him, could have played anywhere in Europe for a few years)
Watson (A beautiful memory)
Baines (World class for a fair few seasons)
Arteta (Also world class, made up to see him doing well at Arsenal, loved him)
Barry (Wish we had him longer, brilliant footballer)
Cahill (If you need a goal, he would pop up, warrior)
Kanchelskis (In full flight? Phwoar)
Ferguson (Unplayable at his best)
Rooney (I've never seen anything like him when he burst into the side)
It will probably be different if you asked me next week.