Re-growing is a great way to go! Harvest as usual except leave a double-handful of greenery around the base of the plant. Cut down the main stem so it is half as tall as the finished plant. Throw her back to vegging for 3-4 weeks and re-flower. Plants that took 7 weeks to finish the first time will finish in 5-6 weeks second time around. Reason is that for every bud you harvest will grow 2 smaller buds in a re-grow. My re-grown plants typically produce 125-175% of the first harvest.
So, re-growing is cheaper, faster and you get a known product for your efforts. I don't see a downside to re-growing unless you have to have huge nugs.
Works for me! Good luck, BigSteve.
PS -- My perpetual grow produces 100 plants a year and re-grows make up 10-20 % of my grows.