Well, I can only speak for the classes I have run in during recent times but...
For Gas mono I would like to see an X468/3 that is made by trimming the tips slightly and the tongues on a X470/3. Because that is what I was doing. Not the fastest prop in the straights, but very good over a lap with awesome acceleration and bite.
For 90 mono I would like a X465/3. The X460/3 are too small for my 90 motors and the next 3 blade is a X470/3. The A100 would run that, but for 90's a larger 3 blade than X460/3 would be nice. Maybe also a X665/3 or X 663/3.
For 90 hydro I would like to play with some V series but as 2 blades. Like a V970 and V972. I dont know, but maybe a 2 blade version would have less of the handling problems. Also some larger 16 series like a 1670 and maybe a 1672.
Nitrocrazed racing: I like big props.