Ping zing 2 or Tight lies
Golf Gear mentioned in this thread:
One thing to consider would be shaft flex. A golf shop would check how the irons "fit you" for a small fee.
Are you taking lessons? If so, take along the 5 iron and 7 irons from each set and see which one plays better. For the Pings, the red dot indicated the irons are about 0.75 degrees flat in their lie angle. A pro could help you on this during lessons.
If both of the iron sets feel comfortable at set up, go with the one which "feels best" during the swing. Confidence in your clubs helps you develop your swing.