well i want to grow atleast 5 plants so ill probably end up growing 6 or 7 plants. its a 6Lx3Wx6H closet.
so now im thinking a 400w MH for the veg room and a 600w hps for the bloom room. would that work or should i keep them the same wattage
What kind of budget are you looking at? I would say to get BOTH of these grow closets setup you'll be looking between $2-3G's. At least the way you are looking to do it.
Little baby's don't need that much light. Use less light, produce less heat, less ventilation, less worries all together.
In your veg closet START with CFL's and big Floro's. You're temps will be easy to control with small inexpensive fans.
You're flower room on the other hand, you'll need a 6" exhaust CAN FAN sitting upon a CAN-66 size filter. You'll need a 4" inline or can fan for your intake.
That's going to the be the minimum to get by with a 600w in the flower closet. 6x3 isn't very large and heats going to accumulate quickly if you don't change the air quickly and often. As a matter of fact in that setup I would use an air cooled light hood, a 1000w light and use ventilation for the room and light hood seperately.
But I'm a maniac and that's something I would suggest you work up to. Start smaller and get bigger unless you've got someone with a lot of experience to help you.
You will design and build your grow room and as you use you will find it's short comings and you'll figure out what you can and can't get away with. Sucks to struggle trying to grow because you have a grow room that just won't work with your equpment.
I'm rambling because I am high, but nonetheless, start with some CFL's and get some things going and as they progress think your grow rooms through and build them to solve specific problems.