The GH line is good, so is the Fox Farm line. The MH gives you a better light spectrum for veg and will promote really tight nodes and less stretching in your plant, the HPS mimics the harvesting sun cycle that takes place in the latter summer early fall and will promote heavy bud development. Both at once will give good results, but that cab will be a tight fit for just one light I am thinking, at least with temps. Ideally you could set up another cab and use one for just veging clones and the other which you may try to build or buy, adding a little more height, for flowering. This way you could have a harvest every two months if you dialed in everything, and with a 400w you could pull 4 to 6 ounces IMO without too much trouble.
Adieu