I'm cooking steak for a friend tonight, which is fortunately one of maybe five things that I can cook with consistently good results.
I only ever buy flat iron, which is an absolute bargain (£14.50/kg) from my local butcher in comparison to ribeye (£30/kg) and fillet (£50/kg). The cut is clearly still a relatively unknown quantity here, so for the benefit of the uninitiated; flat iron was "discovered" as a result of a 2002 study to find new commercial cuts to increase meat yield. It's the second most tender steak on the animal after fillet, but has more flavour.