Hi Frank
I ordered my first premium eyepieces a couple of weeks ago and they should be here in a day or two.
I too bought the 24mm panoptic and 13T6 after reading reviews and assessing my magnification needs (16 GSO Dob). If I like the 12mm eye relief in the Nagler I might get the 9T6; if I don't then the 10mm Delos might do the trick. All are parfocal and use the same setting on my new Type 1 paracorr.
Let us know how the barlow goes. I fear that a paracorr, barlow and big eyepiece would add too much length, weight and glass.