I've decided I want something ultra-portable that's more convenient than my laptop (which is a bit of a beast) and more powerful/versatile than a smart phone. The three I'm looking at most seriously are the IPad (of course), Kindle Fire HD and Nexus 7. Most of my primary uses will be very simple and honestly, most any tablet is going to satisfy them. But obviously, I'm also a photographer, so I'd like something that is going to bring something to that endeavor as well. I have no desire to use a tablet to do any significant image editing (I'll just bring my laptop if I need that), but I would like to do some very basic editing (global contrast, brightness, saturation, etc.) and most importantly be able to display raw format as opposed to just jpeg (worst case scenario, I could shoot raw+jpeg). Lastly, a capability to shoot tethered would be a huge bonus.
That said, I'm guessing the IPad would fit all my needs, and if it doesn't, I'm probably out of luck anyway. I think I'm having a hard time getting past my aversion to Apple products, however. . .that, and although I can certainly afford one, I'd rather not spend extra money for more than what I need. So my primary question is, would either the Kindle or Nexus even begin to fulfill my needs, or is the IPad really the only practical game in town when it comes to a tablet that lends itself well to a photographer?
Hopefully, this hasn't been discussed to death already, because I couldn't find anything through my searches.

