My personal rub is 1 part each, kosher or ground sea salt, ground pepper, garlic powder, and tony chachere's. I came up with this recipe a few years ago and have not needed to change it.
Rub the steaks then marinade the steaks in worshcherise sauce for a few hours before grilling the rest in the refrigerator.
2 small pats of butter placed on top of the steaks two minutes before pulling off the grill never hurts.
The secret to the juciest steaks is too wrap in foil and rest for 10 minutes after grilling.