Nice first tank, I like that canopy/stand combo!
Welcome to the group, you are in good company here!
If you go LED, you should not need a noisy, room warming, electricity sucking chiller.
Are you thinking of DIY LED or production made? DIY isn't too difficult if you know how to solder AND with DIY, you can make exactly what you want.
I know a lot of people use GFCI with no problems, but I had one randomly trip while I was at work and almost lost my tank as a lot of people have with GFCI. If you do use GFCI, be sure to not place all life support pumps and other equepiment on the same circuit in case it trips while you are away.
Instead, I have become a drip line freak, no electrical cords on the floor and cover my electrical wall outlets with weather proof covers pictured below and available at Homedepo. Also, other than my Reef Keeper PC4 power control strips, I do not use any plastic housed power strips/surge protectors - they are a fire hazard!!
It still amazes me all the electric cords we run to/from our tanks! For safty and simplicity sake, I always work to keep them clean and organized WITH drip lines and use over rated (thick) extension cords where needed.
Saltwater and electricity don't mix! ha
If you need anything; help, info etc, post up and ask. We have some really good people here! The only stupid question is the one not asked...
Keep us posted on your build and keep the pictures coming - it feeds our aquarium porn addiction! :lol2: