That's a nice squad for a 12 team league. I think I would accept that trade for Barber. Campbell isn't exactly a solid backup option and if Flacco doesn't pan out it's nice to have Palmer as a secondary plan.
I'd be sure to scour the waiver wire after week 1 for some RB depth. Drop Manningham I don't see him helping your team at all.
Trash Talkin Boozers League Champion 2008 & 2009, Super Bowl Champion 2010