Man for that price, I would go HID. You could pick up a switchable 400 watt ballast with everything, just get a MH bulb and HPS and you would be set for 2-3 plants. Usually the package comes with one or the other as far as bulbs so you would only have to get the other bulb. I hate conversion bulbs they are too $$. So thats why I always say switchable. check this out, and you can upgrade whatever you want like better ballast etc..
then you have your MH for vegg, and HPS for flower all in one :thumbsup:
400 Watt Sodium/Halide Switchable Maximizer Grow Light System