Everything you have listed is right you can get your mother up to a certain height then put it to flower then sex the plant but make sure that you get the males out before pods open.But if you wanted you could plant all your seeds and then take cuttings and then put the plants on flower and root the males out that way.I would take two clone's of each plant just incase one dies if cloned right you should have a good chance of all of them takeing.Then once you have removed the males you could just take clones before budding but don't forget this means that you are going to have to keep them clones for 8 weeks sometimes more depending on strain.But i do think that mother plants are the way to go then you can take plants 3 week before fowering phase ends and put them straight in if you are useing hps lighting in your flowering room you will only have to leave them on flower for2/3 week before you can flower again.Take your clones at the begining of the flowering and you will have to keep them 8 week on veg so you will need a sizeable room to keep them.But the plants can be put straight on flower has soon has the other plants come out.Go with mothers mate it will be less hassle once the mother gets to big just top it or clone a new mother while you start a new bud.