If you have trimmed all the fat off, then I would say the "fat not eaten" is appropriate to select; other than that, you just have to go with the cut of meat (steak, roast) and the method of cooking. I see what you're saying, though...just having the choice of "steak" or "roast," for example, gives you quite a range of fat content depending on the cut, and this is not accurately reflected in the options.
My advice would be, for more specific info, to look on the label of your meat (if it has a nutrition label) or google "calories in...." whatever specific cut of anything you eat, then either create a custom food or find something in FitDay that seems closest and enter that.
"If you drop an egg, you don't say, 'Oh, shoot' and drop the other 11, do you?"
-Source unknown, but obviously brilliant
Reached goal 4/16/2010...but kind of afraid to look these days