Iron Man's price has come down thanks to the VE, but it's still a more expensive game than Metallica and it probably will stay that way. There are a lot of Metallica machines floating around, with more coming off of the line.
I was just able to finally afford an Iron Man thanks to the price dip. I sort of think it will settle in at that $5,000-$6,000 range depending on condition, where Metallica will probably sit around the $4,000 mark for a long time from now.