James,
Thanks for posting and updating. Watching this closely as I’m about to jump back in and am trying to decide between the 250 and 350.
I was having the same debate, but it came down to what I was told 15 years ago: get the biggest you can fit/budget. The options increase and the water parameter swings are easier to control.
Honestly I should have got the 425 for the bigger sump but keep the 4ft width. I do not regret my purchase. It’s an awesome tank.
If you have any questions feel free to PM. I’m pretty busy but I’m always approachable.