EW,

If you are about 140 with a pw, I would suggest a Gap Wedge. In the scoring range 125 - 60, It's good to have many clubs in this range it gives you more choices. One distance for a full shot, choke down 1/2" and 1" for 2 different distances about 5 and 10 yards. You can also move the ball back in your stance the same amount to go up in distance.

Food for thought,

Golfbald