I have varied from black and blue to medium rare. Black and blue is when you take a cold steak and very hot griddle (or in my case cast iron pan). You get a real good sear on each side, I would say a minute at the most and you are done.
I bought a sous vide machine about a year ago and it makes fantastic steak. It is cooking in a water bath. You select the final temperature of your meat, season your meat, and put it in a plastic bag that you either vacuum seal or use water to push the air out, do not put the opening of the bag underwater. Then you let it sit for an hour or two depending upon thickness. What is nice about this is that you can go longer without too much of a negative effect. In fact some people like to sous vide their meat much longer since it becomes more tender.
When you are done take the bag out of the water. Open it, save the juices if making a sauce. And then it is almost like my black and blue steak, a quick sear, except that I will use bit of butter.
Spank your mamma that is a good steak!
The forum needs a "Made Me Hungry" rating just for this post.