There are amazing setups in the shops for dsplays- the greenest tanks you will ever see. Specialist lights, CO2 injection systems, vast selection of plants, shrimp species- the mother load. I'm getting enthused even thinking about it. I haven't had a tank for a few years due to housing changes but might have to make space for one now.
There are all sorts of brands of equipment available- European, US, Japanese, and Chinese. You will have no issues sourcing things you understand. It sounds like you have much more experience than me and will be in fish nerd heaven!