The best way to emulate Nexus 10 is to use AndroVM. I am currently running Android on it with the full Nexus 10 resolution of 2560x1600, and it is suitable for my HD screen if I installed AndroVM to use 320dpi.
Oh .. and this is VERY fast :-)
I personally use it for emulators and real hardware devices, as it is very responsive and the deployment of the APK is very fast.
Incidentally, I myself do not participate in the AndroVM project, but it significantly accelerated my own development cycle. In all development cycles, the developer waits to check if his code settings work using an emulator or hardware device, which increases a significant load on time. I would recommend using AndroVM regardless of screen size in normal code development.
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