Ciao Giulia, how can we say who's Lazio best player? It's like to say if Lambrusco is better than Barolo, or Brachetto is better than Pinot. Evryone has its own nature. One is sparkling, another is rosè, another again suits well with flesh, the Pinot (I can tell you) is very good with fish.
Anyway, in my opinion:
1) Nesta
2) Veròn
3) Nedved
4) Mihajlovic
5) Almeyda
My favourite is the Brachetto, it is excellent with a good bowl of pasta.