A TRON Vault - Converted to Spike 2 with full LCD support with licensed movie footage and theme - appropriate art style, upgraded sound system, RGB lighting, lit ramps, etc would sell at 10k all day long. probably more if they limited it.
As a matter of fact, Stern could take Vault to a new level - a "Boutique Vault Edition" or something exclusive thats limited to 250 machines as described above with the full Spike conversion...they would sell all 250 at $15,000 in less than a week.