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It sounds like you are talking about the Nook.
I am not sure about the usb charging but I would guess that it does.
It does have a touch screen but it is a smaller LCD touch screen at the bottom of the screen. It does seem to suck battery life pretty fast.
It is EPub compatible and can read PDF although not all that well.
It has a memory card slot.
It is reasonably priced.
The new Sony's touchscreens are suppose to be very nice. They are reported to be not blurry and very responsive.
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