1 year now w/my 50mm 1.8, what now for primarily portraitsin natural light?

As to the 70-200 f/4, I own it and use it for solo portraits. However, on a crop body, you'll need to have a larger shooting space. Its not a good choice for group portraits unless you're outside, due to its longer focal range.

For primes, anything from 35mm up to 85mm is fine for indoor stuff. I like the 50mm from Canon, and can vouch for both the 1.4 and the nifty 50. The 85mm 1.8 is a stellar lens, and can also be used for sports shooting, due to its terrific AF performance.

Each lens has a sweet spot in which it performs well. Consider your other uses, and by doing so, you'll have a lens that will see more overall use.

Good advice. Its not about acquiring gear so much as it is getting the gear you need and using it.

Its good that your researching everything, that's the first step. Now determine you budget, the need to be filled, and see what is out there to match. That'll narrow things down a bit more.

You can't go wrong with the Canon 35f2 or the 85f1.8. I have both and they are fine lenses on a crop body. While the 35f1.4 is a better lens than the 35f2, it is heavier and costs much more. I am happy with my choices.
I use my 35f2 much more than the 85f1.8, but you can't go wrong with either.
I'd recommend the 35 first.
If you want to do pro work, then you may want to spend the extra cash, if it is available.

Sigma 30 1.4 and the Canon 85 1.8.

If your into prime lenses, i would suggest buying the sigma 30mm 1.4 and the 85mm 1.8. They make a great 2 lens combo... then just use the 18-55 (im guessing you have one) for landscapes and the like.