All boils down to cash. Good 400 watt MH/HPS system costs about $ 150-175, but then you have the heat issue. Also there is the question of how many plants.. 2 plants you will need to grow a kick ass plant, 400 W (convertible to either HPS/MH) which WILL require venting., is decent, but in a small area I would recommend LED, specifically Pinnacle 360 Watt, dual spectrum ( you can switch between grow (180 watts) or bloom (180 watts) or both at the same time for a total of 360 watts LED, which is killer shit. That fixture on Amazon cost's $ 359, but you will NEVER be dissatisfied. I'm growing 1 plant under it, and it is going toe to toe with 1400 watts of HID. No bullshit. I am a HID guy for a large amount of plants, but for 2, in a closet, definitely the LED fixture I mentioned is the way to go. (1 oz/paid for)
Good luck.