Yeah if your going to make a bigger area your either going to want those huge cfl grow bulbs, or a HPS. When you start using alot of the smaller cfls(23-40w) it does actually just get cheaper to buy a hps. A 250w Mh runs about 30000lumens, where 12 23w cfls run @a total of 276w and only produce 19.8k lumens.....see wat i'm saying, i recently made the switch myself and the heat was easily controllable. And 400w set ups only run for like another $100 and are good for a 3x3area(do a scrog).
With using a hps for the grow you can veg and flower(use a mh for veg if u make a veg box), the hps will produce much denser and bigger nugs then cfls, you'll really notice and love the difference.