Sega Saturn

The Saturn is the console serious collectors reappraised before anyone else did. Its dual-CPU architecture (two Hitachi SH-2s at 28MHz dividing the workload) was brutal for Western developers used to the PS1's linearity, but produced 2D of genuine arcade quality. Radiant Silvergun has no PAL release: Japan only, and a good cartridge regularly clears €300. Panzer Dragoon Saga had a PAL print run of approximately 6,000 copies — sealed, it's among the most expensive games in western retrogaming history. The 4MB RAM Cartridge (required for some arcade ports like X-Men vs. Street Fighter) is essentially mandatory for a complete setup. The ST-V board used in Sega's arcade cabinets of that era was identical to Saturn hardware: virtually the entire Sega arcade catalogue of those years ran on the same silicon.