I got 3790US because...
1). It's cheaper.
2). I can modified to use Asian firmware (Sg/My 2.30., CHN2.20)


But now it's not exactly true because US unit may not be modified to use Asian firmware anymore.
And no one know till the modified rgn is made and test to flash nuvi across region.

For this reason., if we don't have 3760PH firmware so no one know 3790US can be modified to use 3760PH firmware or not.