General Mobile is the first Android manufacturer to bring the DualSim support to the Google OS powered smartphone. The DSTL1 that went on sale in the US recently is by no means a super smartphone with breakthrough features but has the necessary bit along with a Dual Sim Standy mode for you at $499.
Powered by a 600Mhz+ processor, 5MP camera with flash, Wifi / Bluetooth, 3″ touchscreen and 4GB internal memory this one might do well. The only drawback being the lack of 3G support and carrier tieups in US. And if you are on a lookout for a dual sim support for the iPhone, here it is, but you cant use both the sims together!
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