Besides a computer (laptop, tablet, etc.) I'm not sure you're going to find anything. The USB connection doesn't send a video feed. It's a computer port which needs something that knows how to talk to it. And I believe the video feed is just NTSC or PAL (depending on a custom function setting) which, as you've found, isn't going to give you a high quality image. I don't know what your budget is, but I'm suspect your best bet to meet your technical requirements is going to be a tablet style PC.
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