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Preferable a First or Second Founding or a very popular chapter (like Blood Ravens maybe?)

Here's my unit so far:

I am getting another Flamstorm Aggressor, which I've decided should be Space Wolves. But since I do not want to duplicate Chapters, my current SW sgt will need to change Chapters.
Any suggestions, or should I go with BRs and give him back his power sword?

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Skip that noise, lean into the moderately obscure!
Make em Mantis Warriors, Space Sharks, Black Dragoons, Nova Marines, Celestial Lions and whatever other color scheme looks cool from the old "Space Marine Chapters" poster from forever ago.
If you're really interested in keeping to the 1st/2nd founding stuff go Mortifactors, Silver Skulls or Iron Snakes.
Good luck!

Could go Red Wolves. Keeps the same symbol, just a red wolf face and black background. Not related to Space Wolves either.

Their lore also fits the Deathwatch. Involved in the Octarius War against Orks and Nids, suffered horrific losses and were heavily reinforced with Primaris Space Marines.

Emperors Spears or Crimson Fists.

a guy at our local store did a nice trick he did a black shield marine but actually carved the old thousand sons symbol into the pad and painted over is so you only see it under full light