The Seahawks sacked Warner 5 times and hit him a ton last week, and I believe Manning was sacked 7 times by the Eagles before mounting his comeback. The Giants line is weak.
I'd take the Seahawks, even though there is a chance of a shootout. I'd be careful going against the Patriots at home.
I'm not sure you need to drop Feely, either, unless you think he's going to fold under the pressure of returning to the scene of the crime. The Seahawks D gets really stingy in the red zone, so Feely should get his chances.