Now that Apple has released a 128gb iPad, I think this fall/winter I'll be making the firm decision whether or not I want to ditch a laptop completely (I haven't had one in years, but have been wanting to get a MBA).....
Currently I rock a 32gb LTE iPad mini and love the form factor. However I really wish I had more space so I could load some movies on there without having to shuffle things around to make space. I do game on my iPad and with games like Fifa 13 and KOTOR being over 1 GB, I tend to fill up my iPad quickly.
That being said, if Apple really does slim down the iPad 5 and makes it lighter, I might be tempted to switch back to the regular size even if the mini 2 gets Retina.....
And if Apple moves the regular sized iPads to a 32-64-128 GB lineup at the same $499-$599-$699, then it'll be a 128gb LTE version in my future FOR SURE.
And before anyone says it won't ever happen, I'd bet its more likely than you think. Aside from screen size and processor speed, there won't be much of a differentiator between the mini 2 and iPad 5. Which do you think Apple would rather you buy? Even if they increase the storage space in the iPad 5, I think the margins would still be better on the 5 than on the mini 2....especially if they get a retina display in there......
That would make for a much harder decision IMO, and could give both devices a lot of pull and appeal depending on your preferences.