CL, may I make some suggestions?
- Consider yamaya stone or chinese zebra rock. Nice textures like seiryu or manten but cheaper so you can get more for the same price + they are inert.
- Have you considered Eheim Ecco? Ecco 2332 from drfostersmith is cheaper than 2217 and the biggest difference is the auto priming feature. Performance wise both are equally good in my experience.
Everything else looks good so far. Excited to see how this come along.