my first grow was virtually the same man, 1000hps, the 400 MH, the hydro...all of it. Looks good, although i never tried to cover that much space with the 400, we'll see how that goes. I ended up getting 320 watts of flouros to go with it, and still only vegging in a 4x4. MH will stretch the little girls, especially when you try to cover too much space, just a hint, but your results might be a lot better than mine, i was pretty noob back then. I've since moved up to 2x1000hps and a 600 for flower, but my vegging is now all flouros. i just like the node spacing and the precise control i get with the flouros. Under MH plants would grow an inch or more a day in veg!! That was almost too fast for me.
edit-btw i started with all AK, and Big bud, and just a real similiar set-up, but no parabolics (say no to parabolics dude) and I was blown away with my first grow. You got everything you need to grow some nasty buds. When you get off to a good start like you are, it's really not hard at all.