Count me as part of the boat that doesn't think Cpepp is a good buy-low anymore. For starters, this notion that he can be had for bench players just doesn't seem plausible to me. Culpepper is still a big name, and an early pick, and I doubt his owners have given up on him enough at this point to give him away for something you don't even need. You're still going to have to sacrifice a quality starter at another position to garner him.
You can't rely on the rushing numbers of years past, because he's certainly not running as much as he did prior to this year. A proponent of the safeties not playing way off the line to cover Moss perhaps?
The schedule bit I'll buy into a bit. He did look good against the only bad D he's faced, but that makes when he plays average days even more scary.
In his 4 games against the average/good D's, he's gone:
956yds 1td 12int, 53 yards rushing
And to be fair, while some of the D's he has coming up are pretty bad, NO may very well be far and away the worst he'll face outside of maybe St. Louis.
If you can get him for super cheap then he'd be worth stashing, but due to his name recognition alone he won't come all that cheap.