What would it cost to add a basement to a house plan where the main floor was 2400 square feet? I am talking about builders cost. Also, what is a "daylight basement"? thanks

I am finishing-out my basement and am now roughing in the electric using 12-2 Romex. I am planning on adding two 20 amp breakers to the service panel and want to make sure that the breakers, and the Romex, have sufficient capacity for the room. The service panel is also in the basement, located about 5 feet from the room. Lighting. I plan to run 10 recessed lights using 100 watt bulbs, broken into three different runs for switches. I also plan on having at least 3 75W wall sconses and 2 60W lights over the bar. Outlets. I'd like to have as many as 10 outlets. The main power load will come from the home entertainment system, (stereo, vcr, dvd, projection tv), and a mini-fridge. How do I determine the max safe capacity? Can, or should, I run all the lights on one and the outlets on another? What else should I be considering? Thanks in advance.