Bringing back some of Tony's past armored rivals and foes would definitely be great to see, and as for his friendship with Steve Rogers/Captain America, the reason that doesn't get talked up as much as the times when they end up at each other's throats basically boils down to the old media adage, "If it bleeds, it leads." Basically, conflict sells. I am hoping, though, that the upcoming Captain America/Iron Man team-up (mini)series addresses the ups and downs of their friendship in a way that respects them both as characters and heroes.