Dreadnoughtus or Saurophaganax (if it is one)

Aside from the ones you mentioned, for me there's a lot of contenders:

Antetonitrus, Volkheimeria, Nebulasaurus, Xenoposeidon, and Supersaurus.

Astrodon and Ultrasaurus too, but they're dubious

I think all cool scientific names are cursed to become dubious or invalid