G20's are great..used them myself right up to level 79 and the Bladez..You do have to play the "roll up" on the 3&4 irons sometimes..a very good set of irons indeed..my G.I.R was always around the 78% mark the whole 20 ranks I used them..and I am only an average player.
Courteney always gives sound advice...So..
With the G20's I used
lvl41 - 52 degree Ping Tour W 100yds
lvl42 - 58 degree Ping Tour W 85yds
lvl42 - 64 degree Ping Tour W 60yds (great for round the green)
I remember the G20 PW was 115..so that gives you a nice even 15yd spacing between the top 3 wedges...I know then there is a drop of 25yds to the 64..but I believe that it is a must have club..besides,once you take into account the Punch option of the 85 yarder..it all evens up nicely.
At only 200 credits a pop the wedges are well worth it and do the job very well...imho they are superior to both the earlier level Cleve's and the ATV's both of which I tried.
The Clevelands at lvl74+ are great..I use the 100yd and 80yd ones now at lvl 83.., but still use the 64 degree Ping and don't see myself ever taking it out of my bag.