Crowlee please stay on topic and try not to thread-jack.

Growing for seed and growing for bud are not exactly mutually exclusive, but it takes a good knowledge of the plant to do both on one plant- you have to know exactly what your harvest time is supposed to be, and pollinate at the correct time so seed ripeness and bud ripeness occur simultaneously.

Your question was about when to harvest seed. That's what peoples' answers are based on. Harvesting bud is secondary if you care about your seeds.