Well, it will still grow with it, just not to its best ability, Might get a little stretchy on you.
As for the hps, rule of thumb i've always been told is at least 50w per square foot.
Right now i'm using a 400w hps in 4 square feet, so thats 100w per foot.
But, 150w should be enough. You can probably just get a few more Cfl's for vegging,
and upgrade to the Hps when you feel like putting Her* if its a her into flowering.