Kyosho buggy motor recommendations

[GO-RIDE.com]

Wow you either have a crazy light Revo or a mega heavy buggy, and of course things like wheel weight and diameter play a huge role in acceleration characteristics. Gearing alone will not close the gap between two equally weighted vehicles, but one having much large and heavier wheels. All that aside, what would be an optimal race motor for a 1/8 buggy? Both Neu and Feigao? (Edit: both on 4S)

On other forums I read some guys switching from 1512s to 1509s for their race buggies, but some guys on this forum are using 1515s on buggies. That seems to be a huge gap. I assume the 1515 is really for the 60mph jump over my house buggy, and the 1509 is pretty much a race only motor, leaving the 1512 as a balance between the two.