I think what you will most likely hear the most here is "hit up Craigslist for some nice stock toyota wheels"
They are made to fit, simple as that. And there are some really nice looking ones out there.
If he wants aftermarket, 4.5" backspace seems like the magic number. Just gotta remember that as the wheels get wider more tire will stick out. Example, we have 7" wide stock wheels, with 4 5/8" of backspace. So an 8" wide wheel with 4 5/8" backspace will stick out 1" more than a stock wheel.
Hopefully you can read this chart. It's a bad pic I know.