The Spec Ops models are awesome. They can be fielded as a variety of troop types, and generally have more character and flair than the generic troops. They can also actually BE Spec Ops models for campaign play or Spec Ops tournaments.
They come with a sprue of various weapons, and two head options. I used the helmeted option here to fit in better with all the heavy infantry.
Even better than the basic Spec Ops (for variety and flair) are the various "Dire Foes" packs, that have two character Spec Ops plus a characterful civilian per pack (along with art cards and scenarios). With the Infinity RPG on the near horizon, I imagine a lot of Dire Foes will see action as player character models as well.