Which portable ARM media platform to choose?

Question

linux

For a number of reasons, I set out to find a small energy-saving ARM machine for the following purposes: -
reading pdf and djvu, including heavy scans of scientific literature
- surfing the Internet
- watching videos and listening to audio books
- connecting USB peripherals such as gps dongle, arduino, keyboard + mouse -
periodic operation from an external battery (!)
The machine will cling to the monitor, so the built-in screen is not desirable.
After searching among singleboard computers, I came to a choice between CompuLab's TrimSlice and SolidRun's CuBox, but I couldn't find a detailed comparison between them.
They wrote about the Raspberry Pi on Habré, but its characteristics seem to me weaker than that of the same CuBox, and there is also a need to invent a case for it.
Can anyone say anything in favor of TrimSlice/CuBox or recommend other platforms for the tasks described above?

Answer 1

And if you still think about the tablet?
habrahabr.ru/post/138243/
3700 mAh, HDMI output, $200.
There is a younger Paladin model on the MIPS architecture, it costs $ 100
habrahabr.ru/post/138495/

Answer 2

miniitx + battery + case (I looked briefly, Google gave out not very expensive options for connecting to batteries, as I understand it, from car to UPS) ... unfortunately, it is the case and this adapter that will make up more than half of the cost of the solution.

Answer 3

Note to readers.
There is also an IGEPv2 board from ISee for €188.
The board comes with a plastic case from the manufacturer for €15.00.