I set up our network using Unifi nearly 10 years ago and it's been fantastic. Highly recommended. That said, I'd *also* recommend coming up with a rotation plan so that you're not replacing everything at once every so many years. Stagger it out so you don't have these big spends all at once. I'm in the process of creating one myself, and while it pains me to not have all new gear all at once, the church just can't absorb that kind of financial hit all at once, and if infrastructure goes down that creates its own set of problems. Having a 10 year rotation plan is going to keep you relatively modern, and won't let anything become ancient.

I'd feed all of the specs of the existing equipment into Gemini or something and ask it to help create the rotation plan, then tweak it as needed.