scotcher is right. I used the term 'Perfect English' just to put a stress on the fact that I want to find a preferably interesting texts to read which may be considered 'Perfect' in a sense that they are grammatically correct and use modern vocabulary and idioms.
The main difficulty I have when selecting texts is that I don't know whether a picked one shoud be viewed as an example of a correct language usage.
I may read a text written by native English speaker but I wouldn't know whether his speech is correct or not. I have no criteria.