Salt and Pepper work wonders, but I've been on a BPS Double Secret Steak rub kick lately... damn fine stuff!
I pull the steaks out of the fridge and put some rub on 'em and let 'em sweat it out, both sides, for at least an hour under wrap. Maybe even apply a second coat because half of it's gonna fall off into the fire anyways.
I heat up my BGE to about 700 degrees with my Grill Grates on. Throw my steaks on 2 minutes, flip, 2 minutes, flip, 2 minutes flip, and until 135 it (usually less than 2 minutes) for a total of nearly 8 minutes (give or take to desired doneness)
Turns out the best every time.
I also normally buy the costco prime steaks, but the last time I didn't have it in the budget, and bough Costco select rib eyes... visually before cooking I could tell a difference. After? Not at all!
Here's a GREAT article on grilling steaks!