That is strong logic but I also like the black colour scheme without being an emo or being a raging retard...... plus I really really hate robes and the coldly logical Iron Hands wouldn’t dress themselves in such faggotry. Plus their arch-enemies are the biggest scum-humping monsters in all of 40k.
There's also the Black Consuls, who are an Imperial Fist Successor Chapter.
The Black Dragons would be a fun kitbash session.
Then there's the Black Inculpators, the Black Templars (of course), The Black Vipers (Salamanders Successors, officially) the Champions of Thanatos, the Charnel Guard (suspected to be Blood Angels Successors), the Consecrators, The Dark Brotherhood, The Death Eagles (officially listed as Raven Guard Successor Chapter, but may in fact have their origins as Loyalist Emperor's Children who became Black Shields during the Horus Heresy), The Death Spectres, The Destroyers, The Emperor's Shadows (basically Space Marine Samurai. No joke), The Emperor's Wolves (amazingly not listed as a Space Wolves Successor Chapter, but the Blood Disciples Chaos Warband came from their 8th Company), The Golden Halos, The Halo Dragons, The Hammers of Dorn (dead giveaway from which legion they came from), The Helion Legion, The Iron Champions (a successor chapter of a successor chapter, The Executioners, of Imperial Fist lineage), The Iron Talons (they're actually White Scars Successors), The Legion of Night, The Marines Exemplar, The Mortifactors, The Night Watch, The Red Scorpions (Forge World's favorite chapter), The Sable Swords, The Scythes of the Emperor, and The Sons of Dorn (big guess who they are descended from).