You will want some kind of mildew inhibitor. Most paints have it in them or can be added. Just make sure to stipulate with the BM associate.
The Ben Moore guy can tell you exactly what kind of paint is good for bathrooms, and help with color choices. I used a eggshell finish for my bathroom, and the paint has held up to many a hot shower.
I prefer a semi-gloss or satin finish as you can clean it easily and it resists moisture. If you live in a very humid area, you might add a mildewcide to the paint.
I've always use outdoors paint in my bathroom. Never had any problems with mold or mildew in 25 years. Cleans easily.