Hello,
Labbed 25 M='s for speed and 24-24 Bravo 1's for all around performance.
Also, 23 Rev 4's can be a great cost effective option.
You state you have 500HP. I would test something/anything close to start with. This will give us a better base line and point us in the correct direction. We have tons of test props to try if you are interested.
Brett