I personally just bit the bullet and ordered an Acer A700 rather than a Fire HD 8.9. What did it for me was that I could get a 32GB 10.1" tablet with expansion for less than the 32GB Fire HD. (In fact, by getting a case off eBay, I should end up with the bigger tablet, case, and charger for about $2 less than a 16GB Fire HD, case, and charger.)
I get the same resolution (though lower pixel density) and more app flexibility. I also plan to sideload Flash so that I can watch AIV, though that is not a priority for me.
For me, the deciding factor was that the bigger screen will be better for comics, and I won't have to jump through hoops to get my favorite comic company in the ComiXology app.