how many plants should i grow here ?

hello all,
After creeping around for the past couple of weeks ive decided to become part of the forum.

so here if my first oficial plea for help to the comunity.

Im going to start my first grow, going with a home made aeroponic bubbler, fogger, and water stream system
my area is 5'.8 tall : 2'.3 wide: and 2'.5 deep.i have about 6sqft (5.75) and im not sure how many plants i should comfortably fit in their. I will be useing 1 400 w mh for veg and a 400w hps for flowering , and a good ventalation system so heat will not be an isue. i dont know how many plants to grow becouse im not sure what training techniqe i wanna go with. also i know ill be growing ice from nirvana. i obviously want a good yield but i understand i shouldnt expect much. what training techniqe would you recomend for me? , under my conditions i think ive givin all the nesisary info . oh and also do you think its a good idea to grow 4 seedlings just to pick a good mom start a whole crop from clones and then kill the remaning survivors ?
any inpute on how i should go about starting my plants (as i mentiond before, not germinating or rooting clones)

thankyou for all your time

come on fellas
no input at all ?

the norm is 1 plant for each square foot. using that, you can put 6 plants in there. That is what I am using.

I'd almost do five just to give them all some room but yea 6sq ft 6 plants

4 females, flower them quick.
You don't want them any taller then 24" to 28" do to heat burns.
My flower chamber is 6' tall and my tallest plant is 38", but I use a light
mover so I get no burns.
Good luck...