First off, this is a very complex question and also worthy of discussion - Dave Starman is right, you could spend a lot of time discussing this subject. So who is the best "American" hockey player? The first question I would have to ask what position are we talking about? You could break it down by postion - you have forwards, defenseman and goalies.
Another question is what time period are we talking about? You have the present time and the how far do we go back? Do we go on pure statistics?
The game of hockey has evolved due to technology and hockey isn't like it was back in the 1960's and 1970's.