Pusher Prop replacement

[twojoes]

Thinking about changing out my precision 3 blade on my rotax 582 streak shadow.
Does anyone have any recommendations for a replacement? - Obviously would like to see some benefit from laying out the cash - but is there really that much of a difference?

Would 3 or 4 blades be best in terms of performance in a pusher config?

Thanks for any info.

Joe