Choices need help

I'm almost 3 weeks into flowering my first grow in which I used unknown strains ..... In preparing for the next grow I was looking into getting seeds from BC Seedking as I have read good about them and they have reasonable prices and are on the right side of the border for me to get them easy.... I want dominate sativa head stone... I want high THC potent...... i'm growing in a cab with about 4' of hieght 600 watt light .... I was thinking of white widow of BC juicy fruit has anybody tried these from BC seedking

4' is pretty short for a sativa. Top it early or tie it down. Your tops are going to get close to the light.

what else hav u grown

Only this current grow ...not sure what it is yesterdays pic 3 weeks into flower started this grow jan 12 the upper leaves seem long and slender anyone got an idea what it is ....sorry bout the colour but that light ya know the leaves are dark green