IHSA 100 Year Legends
Here is a website recognizing the all time greats in our state.
I do not know if Illinois is the best or not, but it damn close.
Current pros involve Dwayne Wade, Kevin Garnett, Eddie Curry, Michael Finley, Shaun Livingston, Quentin Richardson and Luther Head.
Current top college players like Jon Scheyer (Duke), Sherron Collins (Kansas), Julian Wright (Kansas) and Tony Freeman (Iowa). I could name more but that would take some time.
And of course you cannot go without naming Isiah Thomas, Jack Sikma and Quinn Buckner.
This is always an interesting debate, but if is very subjective. I just know a lot of great players come from this state and it is not completely unusual to see players at the HS level here that end up on TV at the next levels.
Peace