I just found your post while googling & comparing nutrition info on chicken, as I'm trying to determine the same thing. It's amazing how varied the nutritional data is for skinless chicken breast! If it's any help, this is what I've found.
I usually cook fresh, skinless breasts in a skillet or on the grill. The data for "Chicken: Breast, meat only, roasted" that's referenced in most of the data sites seems about the most accurate. I use this info then add the data for ingredients like olive oil or chicken broth, depending on how I cook it.
4oz skinless chicken breast
Though, I think the protein might be a little high, the #'s above are similar to Perdue's "Shortcuts" pre-cooked grilled chicken. Hope this helps.