I buy shell steaks, also called NY strip. I season with salt, pepper & garlic powder then throw them on the grill. I like the thicker ones, but thinner ones will cook quicker if you are in a hurry.
If you get a T bone or porterhouse steak it's really 2 steaks in one... the larger is the loin (or shell steak) and the smaller part is the tenderloin, these are great on the grill or quickly pan fried in a bit of olive oil or butter (season the same as above).