Below-ground concrete sits right against the dirt, so the first thing I want to know isn't what color you like. It's what the slab and walls are doing with water. A basement floor is a lot like a barn floor poured on low ground. You can put a nice finish on it, but if water's working up from underneath, the finish is the part that gives.
Price moves with the room's size, the shape the slab is in, whether an old floor or coating has to come off, and which floor you pick. Water matters most, because drainage work has to be planned and paid for before the new floor. The schedule follows the same list, since prep and any drainage come first. After I see the floor, my estimate lays out your options and the price for your room.