I had considered LED but decided against it since I am just starting and want to keep costs down as much as possible. I may look into LED after a while once it has had some time to get more in use and a little cheaper.

I went ahead and bought the 250W MH last weekend. I hope it doesn't get too hot in there with that since I definitely have to use it now. I am going to air cool the HPS in the flower chamber. I bought an Easy Cool 6 hood for it last weekend also. The 250W MH in the veg chamber will use a batwing type reflector and not be cooled. I am working on a way to set up a PC fan blowing across the bulb not in a tube or anything but keeping a 90CFM PC Fan on it I am hoping will keep it somewhat cool enough to keep around 8-10" from the plants.