A tough one. Anelka was a brilliant striker back in the day but his poor attitude let him down which led to him being sold. Shaun Wright-Phillips for me was probably one of the best players I've seen for City (Before the takeover).
If I had to choose it would be from when I first started becoming a City fan as a kid. My selection would be based on the players at their prime (At their best)
Hart
Zabaleta, Kompany, Dunne, Kolarov
De Jong
Wright-Phillips, Petrov
David Silva
Anelka, Dzeko