Hmm, difficult choice.
In terms of a "real" console, possibly/probably the PC Engine.
For not quite real but as close as youre going to get, it really has to be the analogue Nt mini Noir.
And for the do it yourself holy crap I can play loads of systems including CPS1, CPS2 and NeoGeo games, it has to be the terribly named MiSTer FPGA system
Not my photos.
I'm not sure if those last two are cheating though?