http://ds.ign.com/articles/115/1157818p3.html
Here is an article on IGN that had the launch dates/prices adjusted for inflation. It seems the sweet spot for most Nintendo home systems is between $250 and $300. So if it is going to be "expensive" is will more than likely be between $300 and $400 which isn't that bad considering the 6 year old PS3/7 year old 360 have sku's currently in that price range.