look, let's make this simple -- to back up your argument, please say the following if you feel warner is better than eli: "If I were the GM of an NFL franchise, I would trade Eli Manning for Kurt Warner." considering your passion for this topic i'd imagine this won't be a problem.
You do realize that with maybe one more good year like last year that Warner will probably be being introduced into the NFL Hall of Fame someday, right? He's a 4 time Pro Bowl QB, including last year. He's a two time NFL MVP and he's been a 1st team All-Pro twice. He has, like Manning been a SB MVP.
Next year he will probably surpass 30000 passing yards and 200 TDs while having only about 130 interceptions and having a career completion percentage over 65%. These are accomplishments(MVPs, 1st team All-Pros, HOF, completion %s) that Manning will never ever accomplish because he's just not that good.
If I were a GM right now I would take Warner over Manning in the short term for a variety of reasons. Long term, probably not.
1 - He's cheaper
2 - He's a better passer
3 - He's a better leader on offense
4 - He plays a position where age isn't as important as it is in other positions in the NFL.
Long term I would have to go with Manning.