Reader Pda Which Should I Buy? An Ipod Touch, A Sony E-Reader Or An ASUS Mypal PDA?

Which should I buy? an Ipod touch, a Sony e-Reader or an ASUS Mypal PDA? - reader pda

Originally intended for reading electronic books on the ASUS PDA iPod touch and can read PDF files, but the screens are small to Sony e-reader in comparison (with no intention to buy the Kindle from Amazon, I'm outside the United States. UU.). In addition, other features of the iPod iTouch and PDA are also a plus that the e-reader from Sony does not.