Those arent fantastic RB's in a PPR league, especially a 10 teamer.
No shot DeAngelo Williams matches his numbers from last year. Trade him while his value is high.
I'd package him with Grant (who is far less valuable in ppr), and overpay someone for a pass catching RB like Forte, MJD, or S. Jackson--two for one. Someone will bite. You still have Portis as your other starter, and you can find a scrap heap guy or two as your backups, because guys always emerge.
edit-shit, I see you have Jamal Lewis. In that case, i'd definately trade two of your top three backs for a good pass catching back. Lewis is a decent backup, and you can still find another guy on the waiver wire or pick up handcuffs.