I'd go with the Nook Color and root it. It's probably the most economical Android tablet available. Rooted it gives you way more possibilities than the Kindle which is really just a book reader and web browser(and not that great at web browsing). The kindle is e-ink though which works much in bright light than the Nook Color.
Even though I've got a zoom I keep thinking of getting a Nook Color...to supplement it...yeah that's it, supplement it!