How much ROM do you need? Without the camera feature, there will be no photos to store on an android headunit. Also the USB option for expanding the storage means that having less ROM than the latest models of android headunit won't have an big impact on the storage capacity. Limiting your ROM usage to apps, a 16Gb ROM model will suffice.
The unimaginatively named UIS7862 is the latest and greatest processor used in a large majority of the fastest Android headunits. Having 8 high speed cores and access to an impressive 6Gb of RAM will keep the headunits operating smoothly with anything you can throw at it.
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