Hey Malcolm.
I probably should explain hey! I’m getting a good deal on a used 10” skywatcher dob. After using push-to for many years, and now using Goto on my NEQ6, it’s very hard to go back! So I was going to get the skywatcher goto upgrade kit for the dob. It’ll come to around ~$1100. Compared to a brand new 12” Goto, it’s about a ~$1000 difference.
I guess it’s not so much about the EPs as it was theory – Assuming the same quality eyepiece (Lets say a Televue Delos) would it be worth getting the 12” and using a 17mm or a 10” and a 13mm? Because for $1000 I’m not sure if the difference from a moderately light-polluted backyard would be worth it. Plus 13mm would yield better contrast from the sky on DSOs.
Hence me coming to this part of the forum

I was hoping perhaps you or anyone else could give me your advice on the difference it would make!