I've been a Koobi Kit guy for 10+ years. If I had known they were going out of business, I would've bought a backup or two for when my current one gets worn out.
The only gyuto I use at work is a 270. A bigger knife can do everything a smaller knife can, and cut more product at a time. Using a 210 would make my job harder by a significant margin.
You want to shake things up, get an usuba instead of a nakiri. Very easy to sharpen if you do 45 minutes of research and understand the concepts, and sooo much fun to use.