Denso Iridium. go with the preset gap because the tips are extra brittle and will crack or break a lot of the time if you try and adjust. Supposedly, they only need to be changed every 100K or something crazy like that, but it's easy enough to pull them and inspect every 25,000 just to be safe. Personally, I won't go over 50K on a set of plugs on any of my vehicles. The insulators usually get pretty brittle from heat cycling and the electrodes dull / gap widens too much for my personal tolerance. It's cheap insurance.
NGK and Denso Platinum are good too, but the cost difference is small enough I just buy the iridiums out of habit I guess.
YMMV