There is no right answer for everybody every time. What works great on a dry 70 degree day can be slippery on a wet 34 degree day. Price can be an issue too. I would have him start on tirerack.com. Enter the car info and the desired tire attributes and see the choices by performance and price. I think the site is terrific.
I have been using Goodyear Eagle F1 Asymmetric all season ultra high performance tires on my Legacy wagon for a while now. On my third set. I get about 40,000 miles or so out of them in daily use, and the grip is awesome.
Sure, they tend to wear out more quickly than the original Bridgestone tires the car came with new, even the Bridgestione RE980AS that I replaced the originals with, but the performance and handling is much better.