Rare or blue (depends on the place, I only go for blue if I think they can actually pull it off).

Also, if you happen to a) be in London (UK) and b) feel like getting a really good (albeit rather expensive) steak then check out http://www.thehawksmoor.co.uk/ almost certainly the best steak I've had, and certainly the best at a restaurant.

They only have limited number of each cut, in various weights from about 400g all the way up to about 2kg. I think I had a 600g Chateaubriand, which at £72 (about $100), I'm glad I wasn't paying for it!

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