Check what's chalked on the boards. I'd be inclined to go for the Porterhouse. Minimum 350 grams, 500 for preference. You need the bone marrow on the side, naturally. A Shakey Pete's is a great cocktail to get you started.
As for bars... you know where Seven Dials is, do you? It's, like, Covent Garden, dude. There's a bar every 10 paces or so.