Ping G2 irons, I have the high launch set. Pros for me are the ease of making contact and getting the ball airborne (3 iron is actually my fav), the finish is very durable as well. Cons are the size and shape, and difficulty in moving the ball other than in a straight line.
I am actually in the market to upgrade, admittedly I am a bit intimidated to move up to S59s right now, but the G5s are not that much different to justify the cost of a new set....maybe the S59s one day soon.
I prefer Ping for personal reasons, but I don't think you can go wrong with other brands out there.