Whenever people ask for recomendations on where to get lights, I tell them HTG. you won't find a light that is new of the same quality for that amount of money, anywhere! Trust me, I've looked for a long time. You won't be disapointed with your purchase.
I would also pay the extra $20 or $30 to get the dual system that comes with the MH conversion. I agree, in the long run you should get two lights so you can veg and flower at the same time.