I am a big fan of Televue eyepieces though I admit to not having tried any by Pentax. I own a 31t5, 17t4, 13t6 and 9t6 naglers, 24 Panoptic, 3-6 Nagler zoom as well as 32,25,20,15,11 and 8 Plossl's.
My 5 favorites depend on the scope being used. I really like using the Plossl's on the long focal length achromats. With the Megrez 90 the Naglers are my favorites (31,17,13,9 and 3-6 zoom). With the 66SD the 24 Panoptic replaces the 2" Naglers.
I have not tried any Ethos yet.
