I like Forte/Lunch but not much else after that at RB - Johnson & Nicks is a pretty good duo at WR and Rice has a lot of potential...not a whole lot of depth after that. Davis will be a pretty good at TE...but yeah, looks a little thin across the board - might be able to hold your own in the beginning of the season, but unless there's some extraordinary production from Thomas, Jones, etc - the bye weeks might be tough.
Reminds me of my PPR team - just had a $100 auction and ended up with Forte, Davis, and Nicks but also got Vick, Roddy White and Wes Welker. My RB issues are more magnified as my current #2 RB is LaGarrette Blount! I like Thomas at RB and was pissed when he got taken 1 pick before me at the end.
Overall, I think you'll be alright if Rivers can be more consistent than last year and Lynch maintains his production.