Many things to consider: insulated ceiling or non,angle of beam(all spots,floods will have the degree of angle of the reflector), color of walls, floors, countertops, number% of windows, and areas to be iluminated. Each of your rooms and areas in those rooms will be different. More fixtures are not always better. You don't want your ceiling to look like swiss cheese. Multiple dimmers will give you more lighting choices. Hightlight painting, coffee tables, object 'd art, bars.