New evepieces

I realize this is a hot issue for some however the members here are a lot more reasonable and helpful than elsewhere. I recently got a new Explore Scientific 16" scope and was curious if I should replace my current eyepieces from my 12" Skywatcher.
Orion Expanses 20mm 9mm and 6mm all 66º with exit pupil of 4.4 2 and 1.3
I observe from 6000 to 6500 feet four or five times per month in Colorado Skies are Bortle 6 to mainly Bortle 4. Objects are Pne an Galaxies.
My budget is $150.00 per eyepiece. Also your thoughts on ES 52 degree series
Thank you for the help.
Mark