Well, obviously, in your situation, larger is going to be better, but I'd suggest you look at the size of
print available on a given unit, as well as its display size.
That being said, some
9.7" devices are expected out sometime this year, so those might be worth looking into to see if you want to wait on them.
The HanLin devices are available in the U.S. but you pretty much have to contact the company directly in China to purchase them. As for info on them I thin the best we've got is probably in the
HanLin subforum. I'm afraid I don't have any real info to offer on them myself.
