There's so many factors to consider, ranking formulas are rough.
Turnovers and penalties DEFINITLY have to be considered, IMO. I would say rushing o/d, also, but with Vick running around, it makes it moot for one team on offense (those rushing numbers are scewed).
The thing about rankings is there has to be a 'tilt' for things like injuries (key or not), home advantage/disadvantage - and how much do those things weight numberically? Not to mention play during 'garbage time' - as in the 4th quarter when nothing really matters.
I wish you well on experimenting with a system, it sure isn't easy.
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