How much yield for my first grow?

So its my first time growing and im curious as to how much dried weight I should expect to get.

What ive got:

-5 plants--just started flowering at about 14" -3 sativas -2 indicas
-400 watt hps and metal hallide lights
-hydro grow system with advanced nutrients
-temps anywhere from 70-80... couple times temp has gotten to 90 and stressed plants
-hum 25-60%
-3x3 closet with white paint

Also im using an ebb and drain system with only 6" pots. The roots are growing out of the pots and it kinda looks like they are unhealthy and drying up when the trey is drained. Should I go with bigger pots?
 
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