I have the 32 Gb Kindle Fire 7" model. It fits in my wife's pocketbook and is very portable. The 8.9" unit will not fit and that is it's big disadvantage in my opinion.
With every app added and all my eBooks and songs I still have 21 Gb left on my KFHD7-32. That should hold me until next year's mode comes out in October again.