Actually, the plant looks pretty good. It looks like a sativa and they are usually taller and more stretched out than what you would grow inside. If you top it it will get a lot bushier. The limbs don't fill in. You only get growth from nodes.
I don't grow in pots except to start plants. I look at the earth as being one big pot so I grow in the ground. I'm lucky to live on a farm so there is plenty of room to grow in the ground. But, if I was growing in pots and had a plant that I would look at two different options. First and easiest is just top it and let it bush out. Second, I'd look at cutting off about the top half and cloning it. I wouldn't get quite that radical unless you have done some cloning on a smaller scale.
It's a nice plant. Probably best to just top and let it grow.