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This might me a little late, but I wanted to comment anyways. I expect the 300 to be similar to the 505 in terms of display. So this one should be awesome for mostly text books. Contrast and crispness seem superior to the 600 in my opinion. The 600 looks darker and has the reflecting surface due to touch.
The reason I switched to the 600 and passed the 505 to my wife is, that the 600 can pan and zoom pdfs.
If a pdf is not too much mixed up with text and graphics, enlarging fonts works pretty well. But sometimes reflowing mixes up paragraphs and colums. This is where the pan and zoom comes in. I get the size I need, but therefore have to move around on the page. This works pretty good for the occasional complex pdf.
Having such pdfs on the 505 was a little slow (it still worked, though) and panning was only possible within a matrix of 3x3 squares. So if the pdf is not formatted for the readers display, it can happen that one half of a column is on let's say one of the left squares, the other on one of the middle squares.
So this is my conclusion:
If you primarily read pdfs with images and graphics and multicolumned text, go with the 600 and get good lighting. I can see this everyday. At home in the evening with artificial lighting, reading is not as good as with natural light during my breaks at work.
If you read more text only books, go with the 505 or 300. As far as I know, the displays should only differ in size. With natural light the display is simply awesome and even with artificial lighting it's so much better than the 600.
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