Auto astains and yeilds

Hi, im lookin to start a grow soon and would like to grow just 5 plants i was thinking of the auto strain (big devil) or (ak47) i have a 400 watt hps.
i will be using a compost with a nut at the flowering stage bio bloom im thinking. what sort of yeild would i be looking to get and also what auto atrains are the biggest yeilders as i only want to have a couple of grows a year thanks for reading the thread please post awaybongsmilie
 
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