The type of texture on your walls, will dictate what the painter can get away with.
If you are going smooth wall or true orange pell, be sure to check the finish under different lighting conditions, Skip Trowel or some sort of knock down finish, will require less work for the drywall and painting crews.
Ps. knock down sux!
As Nord said, "Roll It!"
that is EXACTLY right but i would like to add that if you are going smooth or prange peel DO NOT use PVA, try USG first coat or hamiltom prep coat, as a primer then seal and paint, for the extra $$ It is WELL worth it.