If you're willing to take some liberties with historical accuracy, you can get extremely high quality CRT monitors that were used for broadcast work for cheap o

If you're willing to take some liberties with historical accuracy, you can get extremely high quality CRT monitors that were used for broadcast work for cheap on ebay (Sony BVM series, the 20 inch models are easily available). Those are really impressive, but they're not really "how the games were meant to look", because they had costs at least one order of magnitude higher than the parts actually used in arcade cabinets.