Hi Jackson and welcome to Ice In Space
Your Saxon Cielo eyepieces are pretty decent. I too started with them, I've had the 25mm, 12mm, 6.5mm, 4.5mm and 2.3mm. I've since parted ways with the 25 and 12mm. They were ok but I wanted something with a wider apparent field of view.
I still have the 6.5, 4.5 and 2.3mm Cielo's. They are good performers at high power so I will be keeping them. In terms of other eyepieces to upgrade to, I highly recommend the 24mm Televue Panoptic and 9mm Sky Rover aka APM. Those are my only two "premium" eyepieces so far and they are great. Sky Rover in particular are much cheaper than Televue but are really good, I've never seen Saturn looking so sharp and contrasty through any of my current eyepieces as it does through my 9mm Sky Rover!
I do intend to buy more Sky Rover as well as Televue Ethos eyepieces in the future, I'm slowly saving my pennies
I have not yet tried any Pentax, Delite or Naglers yet, the 31mm Nagler is one I have earmarked for future purchase, same with the 3mm Delite. From what I've read, you won't go wrong with any of those three choices you mentioned.
Good luck, have fun and enjoy the journey. A lot of interesting things await your discovery in the night sky
Clear Skies
Joe