Highly recommend cases by Fractal.
For self hosting I’d recommend either one of the Meshify 2 or Define 7, depending on local price and your specific needs. I personally went with the Meshify 2 XL and was blown away by the quality of the case. It’s built well and allows for a variety of configurations. It also makes maintenance very easy as the filters and side panels can all be removed without any tool to handle dust build up.
I switched over to TickTick when Todoist suddenly changed their pricing model a few years ago. I don’t remember the specifics of what happened but I remember being very frustrated with the sudden changes as it would’ve required me to change my whole system.
I’ve been very happy with TickTick since then and would strongly recommend OP checks it out to see if it fits their needs.