I love hearing this! I'm in the process of having a similar pond excavated. I'm slightly warmer in southern OH, but current plan is YP/RES/WE/HSB, instead of your dozen WE, I was going split 6 WE 6 HSB initially. So far its estimated 1/3 acre size with max depth of 11ft due to reaching solid bedrock trying to go deeper. My soil is clay, so hopefully not as many problems with water level. Do you have riprap around your pond? My understanding is the limestone would help filter some of that runoff.

[Linked Image from lh6.ggpht.com]