If they sign RGIII or make a move for Manziel AND spend a top 5 pick on a quarterback, that would be going overboard. If we spend a top 5 pick, I do not want them being an inactive 3rd stringer when I am sure we will pass on premier talent to land that quarterback.
As for Griffin, I don't think it's that realistic. I am sure the team will consider him but he is not going to sign to be a backup, he has a pro bowl caliber season under his belt in a QB starved league, he will get a shot. Dallas isn't going to pay him much more than backup money as well. I am sure his agent will demand a contract similar to what Foles signed a few months ago. A short contract paying him north of 10 million so he can earn a huge contract if he has success. Dallas won't offer him that much money or q chance to prove he is a starter.
Manziel is more realistic because you have him under a more reasonable contract for 2-3 years if you make a move to get him. Only way we will get any decent veteran quarterback is through trade...anyone of any value will sign somewhere for more money where they can play.