28mm Pentax XLs or 30mm Ultimas?

I have a 14", f4.7 dob and a 127Ed and FS102 that I use my Denk
Standards with. I am currently using a pair of 25mm plossls(Chinese),
a pair of 21mm Pentax XLs and a pair of 16mm UO Konigs as eyepieces.
I want to add a pair of low mag eyepieces to complete my set. I am
considering buying a pair of 30mm Ultimas(50mm afov) or adding a 28mm
Pentax XL(55mm afov) to the one I already own. (This is a great
eyepiece in cyclops mode.) The price is not that much different with
either option. I looking for input as to which way to go or perhaps
an alternative I haven't considered.

Mike L.

Perhaps the Pan 27s or the BW UWs?

Then you could sell me the Pentax 28 XL....;-)