If your planning to use 400W HPS & and you have Magnetic ballasts (Philips MasterColor CMH Lamps wont run on digital ballasts) then I would highly recommend you check out the Philips MasterColor CMH Retro White lamps: Only $35 Here--> (
http://www.advancedtechlighting.com/cdmed18.htm) These CMH (Ceramic Metal Halide) lamps produce the fullest spectrum of any HID lamp, they produce more blue than MH and more red than HPS, one bulb can be used for both Veg & Flower, best of both worlds, their hands down the best HID bulb for growing, look up SCOTTYBALLS "Pineapple Express G13 Lab's Seed to Harvest" thread and see what he says about them, if you get them I guarantee you won't regret it, however if your not sure about them just get one and compare the results, once you see how well they work you'll swear by them. As for the nutes, if you don't want to spend a fortune I would recommend Earth Juice Sugar Peak, this is what my go to guy at the hydro shop recommends if your on a limited budget, however it doesn't produce cheap results, if your not planning to veg longer than 2wks then just skip the vegetative formula and get the Sugar Peak Flower, Sugar Peak Grand Finale & Earth Juice Catalyst, the Catalyst is VERY important so don't forget it, the EJ Sugar Peak line produces fantastic results and at a very reasonable price, Sugar Peak has PH stabilizers so if your using soil and hand watering you don't have to adjust the PH, this makes things a lot easier, just mix, wait an hour, water and your done.