The future's so bright you're gonna need shades!
The room is really looking great Joe. Having spent the first half of my working life an an electrician, I am really jealous of these new LED lights. I probably installed thousands of Hi Hats over the years. Always running into obstacles in the ceilings or piping that ran right where I wanted to put a can. These things are barely thicker than the sheetrock. No putting a 6" deep can under the ductwork in the old days.
Having spares is a good idea too. The technology is constantly changing with LED lighting and what you bought today may be gone tomorrow. Not like going to Home Depot to pick up a 90W flood lamp any more.
We use all LED's at the College I work for now. Typically if they are going to die it will happen early in life (within the first 100 hrs or so).
Any thoughts on what the layout is going to look like? Your old one was a beauty.