Ninja 1 , youtube has several 818 headband and I'm sure you will see more coming soon, attitude just had a short promo that lasted about 3 days before they sold out, they were selling cc packs with free jamacian og x6, they also recommend 818 headband, so who knows, depends on what people want.. I personally went with 6x fem Girl Scout cookies, I've heard really good things about this strain even though it's not a high yielder and I've never tried it, it's going to be one of my mother plants in the future if I can find a good pheno.
I'm running 5 reg white widow x skunk#1
1 sage n sour
1 darkstar
1 northern lights
5 ice
first grow also gorilla, don't trust what you read on seed sites, I read that on average a first time grower is lucky to get 60 grams per 100 watts no matter the strain. If it's your first grow focus on other stuff like nutrient schedule, temps, humidity etc etc.
if your focusing on a high cash crop also as your goal, your obviously going to sell it, so who is your consumer? Is it a medical patient, do they have a strain they would prefer you grow, are the seeds more expensive for that strain, thus reducing your margins already. Also if your looking at fast turnover you can't necessarily equate that to highest yield, because if your topping plants multiple times and leaving them to grow bushier or taller for more weeks you can pull a lot more buds as an end result but the time frame will be longer. A friend of mine who lives in the USA is a medical patient and can grow up to 16 plants but he chooses to grow two and veg for much longer, he pulls close to 1.5 pound from each plant and then grows again from seed. Not the most effective way to get a fast crop but he pulls much higher yields than most people will get from 5-10 plants indoors (dependent on grower).