I like the 40k Astartes armour Mk III, IV and V.
MK III: I love the whole sci-fi-Knight look
Mk IV: Not sure why this appeals to me...it just does.
Mk V: Like the common Mk VII but more brutal looking. I always imagined it with a thin layer of blood on it.
Geez quite a few, first there is the mjolnir , then the iron man suits, the powerloader from aliens, snake eyes suit from the sf3d universe, the wolverine suits from command and conquer tiberian sun, Exo squad cartoon suits, Battletech mechs and elementals, The suit from the old anime maddox 01, man I could go on and on
Big decision with the adeptus astartes the imperial guard karskin the crisis suit or the old republic commando but I have probably got to go with imperial guard karskins or storm troopers.
'You are the dregs of the imperium you only live because the emperor wills it so do one thing in you life that will repay him die fighting against the enemies of man and he may just let you sit beside him when you die'