I agree that Janson can ruin good pencils, but I think he can make bad pencils look decent. I am not a huge fan of his overall body of work, but he and Romita Jr. do look great together. I also like his work over Erik Larson.
Obviously, Nowlan is an inking Genius.
I think that Mike Manley is a pretty darn good inker. He can work over just about any style and he doesn't superimpose himself onto the pencils as much as Nowlan.
Wally Wood was a damn fine inker as well. Incredible, really. Like Manley, he could work over different looks.