Rob,
I have a Discovery 12.5 truss dob and an Astrosystems truss 16" dob.I believe the pentax units work quite well and my pentax 10.5 does not ghost on Jupiter in either scope. You may also wish to try the university optics orthos or the ultima plossls which have good contrast and little or no ghosting. I read posts from other amateurs claiming their Radians do ghost on bright planets.
I have a Discovery 12.5 truss dob and an Astrosystems truss 16" dob.I believe the pentax units work quite well and my pentax 10.5 does not ghost on Jupiter in either scope. You may also wish to try the university optics orthos or the ultima plossls which have good contrast and little or no ghosting. I read posts from other amateurs claiming their Radians do ghost on bright planets.