Have read loads of threads on the Saitos. Seems the most popular choice for 3D would be the APC 14x4W. Heard of guys using 13X4W and 15x4W APC, and Pro Zinger 15X4 wooden props.
I am running a FA 80 on 20%, it swings the 14X4W at about 10 200 rpm, which compares similar to what guys are claiming on the 82.
have also been running a 13x6 master airscrew type K 4 stroke prop, which seem to work ok, but I think it has a bit too much pitch for 3D, not as punchy as the APC 14x4W. wooden props are lighter, and spool up quicker, but havnt found the pro zingers here to try.

Cheers,

Gus