They will double and triple in size during flowering.......got a good tall ceiling right?

That thread of Stinky's should help you decide......I've had MUCH BETTER success with Stinky's method of transplanting several times vs once and would DEFINITELY recommend several transplants for yours.

My plants grew better, faster, healther roots, and just plain became bigger, larger, and healthier plants imo with transplanting into several containers vs just one.