via 40k radio
Centurions can be taken as Elites or Heavy.Heavy support are the devastator option. They come with twin-linked Heavy bolters and Hurricane bolters. Hurricane can be upgraded to missile and HB upgraded to Twin- Las cannon or Grav-cannon and grav-amp.
If I had an extra $500 or so I'd consider taking as many of these as an army can field and adding Dark Angel allies with a dakka banner for an insane number of bolter shots every turn.
dakka banner is DA codex units only, otherwise I would already be running stern guard with a banner
Ah yes, damn gw and there rules making sence this time.
And about the centurions, armor 2+, no invuln, t5, looks like tac squad with grav weapon is a pretty good counter to it