Rib Eye, NY Strips, and T-bone are my favorites for grilling. I'm generally not a large sirloin fan because they tend to be tougher. Could probably be fixed with tenderizing, but I'm lazy. Minute and round steaks, I save for the crock pot and mushroom soup.
I agree a good steak doesn't need much, but some Lawrys or Tones Seasoning salt makes everything better.