Light decisions, help!

[Aquattro]

I'm not familiar with the Kessils, so not sure if they're enough. The fixture you listed might be ok, but I'm not sure how you control it.
My preference is the AI Sol lights, you could use 2 of those which would cost about 900 with the controller to manage the profiles.
Reefbrite has some fixtures too, but a 4' will run over 1200 bucks.
The AI or Reefbrite would probably support anything you wanted to grow. Kessils, not sure, but I think a few people here run them, maybe they can chime in.
The fixture you linked would probably be fine too, just email Martin @ Modular and ask about controlling it.