John,
I realize this post is rather old, but I'm shopping for props currently and I'm curious about your results. I'm looking at a set of Mirage 3 blade 19p but don't want to under prop. I run at sea level most of the time.
Would love to see some pics of the boat as well.

Depends on the power of your engines. If your gonna run higher HP than stock your gonna want 23p. I am running 21p now but can turn the engines past 5000 full throttle with six guys. Do your self a favor and pay to try the props out before you buy. I have spent way too much on props and now I have more horses and need different props. I like the mirages but may try Rev 4s. Someday

There are pictures on this forum just look for 269 back in action

Currently stock motors are in it, so I guess I'm on the hunt for some 21's
Thanks John, your boat looks gorgeous!

Thanks
 

Thank you, I love driving it!
If you have any questions don't hesitate to ask,, I'm not an expert but at least I have a little experience with your model boat. Have fun and keep us updated.