If I wanted one portable hand-held device in addition to my desktop computer and my crapola LG Verizon phone that I use for emergencies only, what would make sense?

I like the idea of carrying something around that would give me access to the internet, allow me to read and write email, download books, and get a few interesting apps. No video, no music, no texting, no games (well, maybe Angry Birds).

Too many choices. I have an unused iPod Nano sitting in a drawer. (Anyone want it? First come, first serve.) I also have a decent camera that I do use.

I have a medium-speed.DSL connection.

The new iPhone or the iPad comes to mind. How do I learn how to compare and contrast? And what would I need in order to use it around my house and gardens without plugging it into something?