Here was my thinking for why people might pick any of these guys:
Manning -- best resume/past production.
Brees -- best combination of future potential and resume/past production.
Romo -- most mobile of all the elite QBs, young and great combination of past production and youth. I know lots of people like having a QB that can move.
Rivers -- tons of upside, young with one huge year.
Roethlisberger -- winner, young.
Ryan -- youngest of the top QBs. Huge potential.
Cutler/Brady are there too, but I think you'd have to want Manning (just about everything Brady brings without the huge injury concern) and Ryan/Rivers over those guys. Just less issues, IMO.
I'm aware this may reek of homerism, but why would Roesthlisberger be there and not Eli Manning? Eli is a "winner" and "young" too but doesn't have the injury history, especially a ton of concussions, that may shorten his career.
Same reason I didn't put Cutler up there -- didn't want a bunch of mid-20s guys. Was curious how the split would go along the Manning-Brees-Rivers-Ryan age lines.
You've lost me on why you put guys up from before Eli's draft year, two guys from Eli's draft year, and guys after Eli's draft year but somehow age disqualifies Eli as an option?

How about that he's better than Roeslisberger, more proven then Ryan and more clutch then Romo. Does that make him qualify for your list?
If you are just curious about an age split, you've constructed the poll all wrong by asking people to pick a particular player. It just seems like you really don't like Cutler or Eli to me.