I'd go with the Blacksuit Superman. Bit of a better canvas to start with. The Warlock wears a gauntlet, so the hands are a bit different from each other, and the waist has no articulation. Thats just me though.
Are you doing Emperor Vulcan, or the original costume? If you're going to use a Wonderman head I'd advise resculpting the hair, I've seen a ton of people use the Wonderman head for Vulcan.
And yeah, his hair will be either sculpted over or shaven and reshaped.