Ribeye if I can afford it, otherwise the Costco tri-tip with the rub.
Sear it good in your cast iron skillet and put it in the oven for 10 minutes or so. Do not overcook it!
My BIL worked in a steak house for awhile. He can make a Prime Rib like no one can. He stabs garlic cloves in it.
Actually, last year we got the cheaper Costco Prime Rib with the rub and it turned out great. And I cooked it!