I used to use a hps for both vegging and flowering , It works perfect ...
Then i found it cost to much money to run it 24/0 so i got a lot of cfls 400w* and they do the job just as good only cost less to run

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What is a MH, Where can I buy one, And what are they used for.

I think if one only has one HID light, the best route is to veg under floro. Of course, IDEALLY it is best to veg under MH & flower under HPS. I think once the plants hit any HID light in flowering they love it.

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im veggin right now using a 400 hps and floros u can use a mh but hps is better if u have a cool tube u can put ur 400 watt within inches of ur tops no problem i might get a 250 or 150 hps to veg because it has more lumens than an mh (more lumens more plant growth more yeild)so i can just use my 400 to bud and keep it on for just 12 hours because using it for 24 or 18 hours is alot of money in the states a 400 adds an extra 47 dollars on my elec bill every month so i rather run a 250 or 150 for 18 hours

Metal Halide systems can be purchased at InsideSun.com as well as conversion bulbs if you want to run MH from your HPS system, and you could also purchase MH conversion bulbs from 400w HPS-MH conversion bulb 1000w HPS-MH conversion bulb

They cost a bit, but it's either 1 system 2 light, or 2 systems, 2 lights.

MH is what I consider to be top notch for vegetative growth.

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So am I better off using a 400W HPS during Veg and Flowering?

Yes, rather than using your 2 CFL bulbs.

You might consider purchasing a MH conversion bulb though, it will provide you at least 2-3 vegetative cycles, and you can decide later if you want to continue with MH, HPS, or Flouro for your vegetative cycles.

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47 what a month?

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nuffin, the more i read the more easier growing sounds!

ill just settle for 1 400hps for my first plant. i need to experience this thing called 'trial and error' [=

if its your only choice ther is nothing wrong with vegging under hps as GrowTech has suggested .... however you can purchase a metal halide conversion bulb also as GrowTech has suggested which will screw in and run flawlessly in your hps lighting system which will be better for vegging than the hps would be
but again if all you have is an HPS your plants will veg fine under it