I would say wait for a month and go for the 3G one, it would be a much more useful with web on the go, rather than a home use only tablet without 3G.
Buy it on the first day of travel, or better order one earlier so that it arrives/will have arrived by the time you land up in USA, then you will not miss it during your travels
And 32 GB storage also makes a difference, since there is no micro SD expansion slot.
That sounds like a better proposition, although I'm a bit disappointed at the sorely missing microHDMI option!
And BTW, I'm off on a wedding cum vacation trip to the north of India. My international travails have reduced considerably over the years