How much is the base system? I thought this system was the cheapest, but all the prices I see are of ~$500 bundles. What's the deal with the retro games? How's the controller work for old games? Do you get these games from an on-line download? Also, are most or all of the games only playable by swinging/thrusting/hammering/or throwing that funky controller? Never played one of these things, just get the impression that they are trying to get kids to be more active while playing games.