I think that most of Deva Path's techniques are useless against Itachi. Itachi's Susano'o wields the Yata mirror, which is said to be an ultimate defense. On the other hand, Deva can also repel techniques with his ability, the only problem would be the time restriction. While Deva is unable to use Almighty Push, Itachi can thrust the Sword of Totsuka into his chest, or engulf him in flames of Amaterasu. The flames wouldn't make much impact though, Deva is a dead body, thus doesn't feel pain. As long as he's being manipulated, he will stand. Itachi would have to either remove the charka transmitters, or seal him. Restriction would be difficult, since Deva's technique is powerful enough to leave a crater where a village once was. Then again, it wouldn't be very hard to seal Deva while he's vulnerable. Chibaku Tensei, requires Deva to make preparations, such as finding the right spot to successfully concentrate and perform the technique, and I doubt Itachi would give Deva the time to do this.
In the end, I believe this can go either way. Itachi might fall to the ground first because of the strain Susanoo places on him, he'll eventually run out of chakra. Or Deva can be sealed by the Sword of Totsuka.