I would rock 4 400 watt lights. SOG or a SCROG
Seriously? Over 1600 watts in a 5x5? I hope you didn't take this advice seriously Amwar420.
What do you want, LED or HID?
If you want LED, you could get some Platinum LED Panels, the P1200 model which draws about 758 watts in Bloom and half in Vegetative stage
https://platinumgrowlights.com/products/p1200 if you want to save and buy almost the exactly same panel, you can get from E.shine for half of the price $650 and uses the same wattage as the Platinum LED
You can see they are very similar products, and E.shine claims they make the Platinum.
I also recommend the Mars II 1200, it uses around 520~600watts for only $435.99
If you want to go with HID's, I recommend a single 1000w dimmable, 1000w, 750w, 600w. That way you can dim it down during the summer if it gets too hot, during the winter you can increase to 750 or 1k. I am running 2 of them right now at 60% power, sometimes I go up to 75%, but I am going to switch to full LED in my next run.
Here are some pictures of what I have right now on week 5. I have 2, 600w running in a 7L x 5W x 5H. As you can see I have very limited ceiling but I am still getting wonderful results. You having high ceiling will be able to spread your lights way better than I.
Peace