Personaly ..i would say go for iv ..because war machine is very inaccurate to how he is on screen ..and i can see them releasing a battle damage version or just an overall improved more accurate version of him in the future ..the iv although lacking in features is still one of the marks ..and apart from being very slim he is perfectly movie accurate in terms of what the suit can do ..even if it is sweet f all lol. ..but then again you already have the BDM3 ..so warmachine would look better next to him then just an other ironman variant. . I myself am gonna get iv .. because it may be the only clean representation of ironman we may get from this line.