At the moment I use a 1984-US-motherboard which works best and gives me
what I want most (on my current NTSC-capable TV-set): The closest
approximation what a games developer (or gamer) saw on his screen under
the best circumstances in the beginning of the eighties.
Because I wanted to use this board in a German case I had to tinker
with the cables (keyboard and speaker) and to get German characters on
screen I use the German ROMs and a nice adapter, which is sold by
GSE-Reactive.com. Highly recommended.