I'm not sure if you will want to start RGIII until you know see him play in a real game.
Also, i'm not sure about Sproles as your #1 RB, he can be pretty sporadic when it comes to point totals.
Mendenhall was recently pulled off the PUP list so hopefully for you he returns as the full time starter.
Your receivers are definitely your strengths, what draft spot did you have? I'm also you assuming you pulled the trigger round 2 on Jimmy Graham? See if that pays off, idk.
Depends on your scoring system of course, because maybe RBs aren't as important.