Need help finding a RTR hydro prop replacement.

I found a new Miss Excite 24" hydro on ebay that I would like to run with my son. So far we are using the Stock Atomik 60A Pro Marine speed control, the motor is V500 2000KV marine outrunner. I'm starting with an inexpensive 4S 14.8V lipo battery. The stock prop according to the manual I found online is a 3 blade prop D32 P1.4 -EKOS/ME (I'm not sure what the letters mean). I would like the boat to perform well, and we are considering starting to race in amateur RTR mixed class along with having a lot of fun with this new hobby. What replacement prop do you suggest as a starting point? It hasn't been in the water yet.