Looking for a higher yielding strain?

Suggestions?
My grow space is to small. So I'm unable to grow enough for my needs with the strains I am running.
So I'm looking ind/sat cross with decent potency and flav to go along with a heavy yielder.
I grow 100% organic.
I will try to buy 3 or 4 different strains to select a keeper or 2.

Add lights and veg longer. Most strains today are of fairly similar yield. If you increase yield normally the strain will not be as potent. In the case of Big Bud atleast, id imagine critical mass as well. What have you been running?