I play a 58deg/10 bounce wedge for my bunker shots ive also got a 54deg/10bounce wedge in the bag but I tend to use my 58deg for most of greenside bunker shots
Depends if you are a "digger" or a "slider". If you tend to take big divots and a lot of sand in bunkers (Digger) then you need more bounce. Doesn't help with tight lies on hard ground though! If like me you are a slider and tend to hit the ball with lttle or no divots you probably need a lot less bounce.
Like a lot of others, it appears, I use a 12 deg bounce 56 for fluffy/normal dry sand and a 60 with lower bounce for compacted/wet/where to hell is the sand in the bunker situations.