The price difference (after adding in shipping, GST, admin charges, etc) of getting from B&H and Adorama, compared to getting a local set in Singapore is almost negligible... I would say you won't save more than $50 - $100 max while going the long route from the US... Plus there'll be added worries that B&H or Adorama might just ship you a returned set, which may or may not have problems with the unit.. If, touch wood, it happens, you won't be able to know nor do anything about it till a few weeks to a month later when it arrives in SQ...
Even then, no international warranty, so you also won't be able to do anything about it.. Except maybe to kick yourself for wasting money...
The only real benefit for getting a Sony NEX US-set is that the local sets are region-locked for PAL systems, and will not allow you to shoot in 24p... The US-sets, being NTSC-locked, will allow you to do that...
So unless shooting in 24p video is really important to you, you're better off spending that few tens of dollars difference, and save the anxiety of crossing your fingers and praying whilst waiting for your set to arrive from the US...