you are forgetting that the sd-card can break with your phone.. what will you do if you loose the phone?.. gl finding that micro-sd. And on top of that.. a microSD card can fuck up and suddently it won't be recongnized. 16GB phones are more than enough, just learn to use it.
pls see my collection
[link]
And $350 for their flagship is still a bit less than $650 for that of Apple