With the Apple eco-system, basically none really have a chance. I think this iPad mini though comes in at $299. Why?
Retina display and nice back camera. There is no way this thing doesn't have a retina display..the iPhone has one. The iPad has one. No way they release the one between without one. They also both have cameras. No way they release the one between without one.
So you will see a $299 price...I'd jump on that in a second...most will...because for $100 more, you get a better product, better design, better OS and better eco-system. Eddy Cue even said Steve warmed up to the idea of a 7" tablet for on-the-go.
That's why it will be $299...mark...my...words.

Plus, wouldn't be surprised to see the iPod Touch drop to $175 or even $150. It's niche is going away...probably the last swan song for it.