I had been using my old galaxy tab 7" for almost a year and just sold it recently. My take on email for android, it's splendid. Just set it to "push" and you should be fine. My email received on my phone is even faster than my laptop connected to office network. Each time my phone notify there's an email, my office email network tend to arrive like 10 seconds later.

Oh, for blackberry, you need to pay for BIS while android or win mobile, you don't pay a single cent except for data charge.

If you want to watch stocks for android, i prefer to use bloomberg apps.

ebook reading should be fine. But if you love to read Zinio, even my older 7" tab had problem reading without zooming in or out.

I am waiting to see whether 7.7 can read Zinio properly without the need to zoom in.