Yay! I got here late, but this now means that my advice to you (which I am about to give from the future) has been taken by you already (in the past).
Get an iPhone.
I personally have never been able to go over my 300mb data plan
For speed, go the 4G option.
and FACETIME calls.
Skype works better on the 4G iPhone too.
Glad I could help.
