Just keep the sativa short by topping it when its 2 weeks old and keeping it in fairly small pots to stop it stretching to much.
I repot the sativas 3 times in my small area and the final repotting is when theyve been flowering for 3 weeks,this slows their height growth right down and makes em get fatter than usual for a small area anyway.
A good high i found was shaman and ive used that plant in my crosses and you can still smell it not quite as strong a smell as the original shaman but its still there.
Has about 14% thc,so if you harvest it after 10 weeks it will just give you an up high
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