Players I consider to be at least reasonably complete:
-C.Ronaldo: Reasonably quick, good dribbler, good shot, good header, left foot, right foot all the same to him
-Vieira: Great ball winner, powerful surges, big physical presence, could pass and shoot
-Shearer: Quicker than was given credit for, strong, amazing shot, good in the air, reliable on pens
-Keane: At his peak, the definitive box-to-box midfielder and very strong mentally
-Toure: Strong and quick, amazing slide tackler, heart of a lion, incredibly comfortable on the ball, very powerful shot
-Maldini: At one stage he was IMO the best player in the world, although he never got the award. Great in the air, quick, great tackler, marker, positioning, reading the game, humility, loyalty, and a lot more effective bombing on from LB than people realise.
Potentials for the future:
-Clichy: Great pace, dribbling, passing, crossing, tackling, positioning (note how he often comes quite far infield to cover the CBs)
-Richards: Has the raw attributes, just needs to learn how to mark and keep a cool head
-Huddlestone: Fantastic range of passing, decent shot, can tackle, and with a physical presence like that he should never get outmuscled or be beaten regularly in the air
Reviewing my list I've convinced myself that Maldini is the closest thing I've seen to a complete player.