If I were to move beyond the 2nd hand NUC market, I'd be looking at the Beaglebone X-15:
https://beagleboard.org/x15
The board is US$269. The
recommended power supply is US$24. It appears to have a lot of headroom.
Quote:
BeagleBoard-X15 is the top performing, mainline Linux enabled, power-users’ dream board with a core tailored for every computing task and a highspeed interface for every connectivity need. Give your algorithms room to stretch!
Processor: TI AM5728 2×1.5-GHz ARMŽ Cortex-A15
2GB DDR3 RAM
4GB 8-bit eMMC on-board flash storage
2D/3D graphics and video accelerators (GPUs)
2×700-MHz C66 digital signal processors (DSPs)
2×ARM Cortex-M4 microcontrollers (MCUs)
4×32-bit programmable real-time units (PRUs)
Connectivity
2×Gigabit Ethernet
3×SuperSpeed USB 3.0 host
HighSpeed USB 2.0 client
eSATA (500mA)
full-size HDMI video output
microSD card slot
Stereo audio in and out
4×60-pin headers with PCIe, LCD, mSATA
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It would fit in a Mac Mini case I have already!