Assuming you mean an allied detachment, the most your getting is one squad of devestator centurions and one squad of assault centurions. You want/need a CAD for a lot of centurions.
If you use Sentinels of Terra (Imperial Fist supplement) you can run two sets of Dev Centurions, one as Elite and one as Heavy, in an Allied. That's the best you can do.
- It's as listed above. Every marine chapter with its own codex is different, otherwise they wouldn't need their own Codex.
Blood Angels get fast tanks, Death Company, Furiosos and (my all time favorite) Librarian Dreadnoughts.
Dark Angels get Ravenwing speeders, their own fliers, unique terminators.
Space Wolves get, well, wolves. Also character dreadnoughts, the Stormfang, and more wolves.
Vanilla Marines get Centurions, Hunters, Stalkers, and Land Speeder Storms.