AB69Z

Don't forget to add the cost of the props

SR-71

Looks like Arneson has two versions of the Bravo Conversion Kit:

Model 7M uses Speedmaster Prop

Model 7MB can accepts standard Bravo style prop

A.O. Razor

A set of BIII props aren't exactly cheap. And the SSM props are a lot stronger than the Bravo props.

I'd think the SSM props are the way to go on the 38EC.