Following as i'm anxious to see what you end up with (lights and filtration).
I'm planning to swap my 37 gallon TALL tank for a 40 breeder at some point, just for better tank dimensions.
FWIW -- I'm just running 2 HOB power filters and that's working well for me, although I'm purposely not going overboard on livestock.
I can't really run a sump due to space constraints -- tank's in an otherwise useless nook in the house. (Plus, I just just don't want to).
*If you happen to go for an AIO kit like someone mentioned, I'd like to see/hear how that works out for you.
I'm also interested in how that glass lid works out for you with regards to lighting.
I just have a cheapie plastic hood that holds white light LEDs right now -- No corals but thinking about doing something so I can at least try a beginner soft coral or two (GSP, Kenya Tree, Xenia, something like