if you have the money/space and want a strong light with low heat output go with the floros i linked you too.. just get the bloom bulbs tho.. they will work for both veg and flower...
if you want a strong light, are limited on space, but can afford to spend a little bit on an exhaust fan and reflector go mh/hps.. hps will be cooler temp wise and can be used straight through.. so you dont need to get a dual ballast.. or you can get a digital ballast
http://www.wormsway.com/detail.aspx?t=prod&sku=LDB142&AC=1 that runs both mh or hps.. you dont need an air cooled reflector.. but will be thankful you do if you run one of these lights..
if you are tight on space and dont want to worry much in the way of exhausting lights then go with the cfl and ballast combo i showed you earlier...