Good question, Bob.
I’ve noticed a trend in club making and in teaching wedge play that heavier wedges seem to be preferred for the majority of golfers. However, some tour type wedges, like the Maltby Tour Grind wedges (http://www.golfworks.com/maltby-tour-grind-mg-wedges/p/MA0233/), are about 10 grams lighter each.
In the old days, almost all iron and wedge shafts were heavy, making the swingweight of clubs heavier. With the advent of lighter shafts, especially many graphite models, the swing weights are much lighter, sometimes too light to feel the heads, which is vital to good wedge play.
From a teaching standpoint, I try to get my golfers to swing the wedge like a pendulum instead of hitting at the ball. Once you take your backswing, a heavier wedge almost swings itself.
If you want a lighter wedge head, go with the Tour Grind. If you want to reduce the swingweight in your wedge set, you can counter balance with a heavy grip and/or a weight port under the grip in the butt end of the shaft. I’m sure Britt or Jim will have more to suggest.
Hope this helps!