The 7" Kindle Fire is my current #1 geek necessity. It goes with me everywhere.
The 7" screen is a great size, not too big, not too small. It comes with 8 GB of onboard storage, and a slot for a MicroSD card to add even more room.
The cool thing is, if you don't mind an ad as the screen save, you can get it for $50. THAT is a deal in my book.