Js 440 650 swap looking for best pump set up

A

Anything w/a motor

Hey Guys I have a js 440 that I recently got a 650 sx to swap.
Looking to get a top loader soon and gonna put a 550 pump in.
My question is what is the best pitch impeller to get the most out of the gate with out effecting top end a whole lot? Was thinking a 17 or 18
 
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