I'm looking to buy a ebook reader; however, I am unsure of which one to purchase. Kindle which costs $360 or Sony's Reader for $400. I have read the reviews about both items respectively but found relatively the same about of positive review.
My main concerns about the item is whether I may put my own .pdf files into them and dictionary for me to check up words. How anyone help me find the appealing distinctions between the two?

You are very well appreciated.