I think that you'll find in an indoor setup 2.5 per plant isn't bad at all. Keep in mind that was under a single 400w HPS. Not 2 1000watters. Of course larger lights can yield larger. That being said, I grew those completely organic as well so I'm sure they can yield more than I pushed them to.

As far as top 3 strains in any category, I'm afraid you'll get as many responses as there are people in the world because of the nature of getting high. If you stick with a reputable seedbank or breeder, you can be fairly sure you'll get a good product in the end.

There are so many wonderful strains to choose from it would be impossible to narrow it down to 3. Personally, I think my next purchase will likely be genetics from TGA/Subcool. Anything you pick from them will be a winner. Nirvana has great genes if your on a budget (or not), and there are quite a few others that people swear by. Just a couple ideas in an ocean of possibilities.