12 team keeper league. I have Rodgers, Romo and Newton as my QB's

I get to keep 5 total players, among my possible keepers are:
Aaron Rodgers
Cam Newton
Tony Romo
Arian Foster
Jamal Charles
Calvin Johnson

I'm wondering would it be more value to keep Newton going forward or Romo. I also have the option of working a deal for Newton and have been offered Chris Johnson for him. I'm not sure how Johnson would fit into my keeper plans with Foster and Charles already there.....am I crazy to turn this down? I just don't want to give up Newton if he'll be a top 5 QB for the next 8-10 years! I'm appreciate some opinions. Thanks

Right now I'd probably rather keep Newton, but that could change between now and the end of the year.

I'd also be scared of keeping Jamaal Charles. His game is so reliant on speed and even if he gets it back, it probably won't be in 2012. I would keep Chris Johnson over Charles.

With a lot of keeper worthy players I would try to trade Romo + Charles for Peterson/McCoy/Rice/McFadden. Might have to wait until later in the year when teams fall from contention to get that deal though. Then you would have clear keepers in Rodgers, Foster, Calvin Johnson, Newton and whoever you acquire.

FYI, I had Romo and Newton. I just traded away Newton and got back Adrian Peterson. 12 team 1/2 pt ppr. The other guy was having QB issues. Newton is a better points getter than AP (149.73 to 128.3) in my league.