Buggyyy:
Get the Cleveland 56, 60, and 64 degree wedges. Play them without spin to get used to them. Then, you can add spin as you adjust.
Lonnie, This^
I also have the Rapture irons and the Cleveland 56, 60, 64 fits in very nicely, though as RUNWME points out the L25 & L33 Raptures go down to 100 yds. so the 90 yd. 56 degree Cleveland might not be needed. I have the L48 which goes down to 110 so the 90 comes in handy. I've noticed many players use this combo (56, 60, 64) to go with various brands/models of irons. I'm not familiar with the TM or Ping wedges, they are popular, too.
As to how degrees of loft correspond to the nomenclature (pitching, approach, sand, lob) google choosing wedges. For example one site says:
PW – 46 to 48°
AW/GW – 51 to 53°
SW – 54 to 58°
LW – 58 to 60°
The 64 degree ones would be called a super loft wedge. I think for WGT the names are less important than the type of loft (med/high or high) and the rated distance.