The Android/Arduino will be doing more than just radio controls - otherwise I'd use something commercial.
I plan on using the space for the screen of a device that can:
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Control emergency lighting (I am a volunteer firefighter)
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Control a siren
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Control power to 5+ radios
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Control power to 2 Computers and 3 Monitors
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Adjust settings for the emergency lights (to keep them legal as I move from state to state)
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Play music (FM and MP3)
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Use the built-in Android software for navigation (I have no intention of doing navigation myself - yet)
I didn't mention this initially since I already have 1-5 working (7 too, but I can't claim to have done any work for that :)).