Really I haven't a clue, but I would venture to guess 40k-60k for the pair in a private sale. If you could get them in a top auction during strong economic times and were able to get a couple of people to fight over one or both of them you could really blow that number out of the water.
Awesome cards and you show them off like a proud parent with a set of twins! I've admired them on numerous occasions, but I'm curious to how you obtained them. Of course I don't expect you to tell what you paid, but were they private sale, auction, or card show pickups? You know if you sold them you could probably upgrade the site and add a flash intro with explosions
