Hi Jen, I hope you're still out there as it has been quite a while since you first posted.
Johannes Christophorus Knauer and Elizabeth Imhoff were my 5th great-grandparents. My mother was a Knauer.
I don't have a lot of information on the Imhoff family but I'll tell you what I have (you may have gotten this info already).
I found a deed from a purchase of land from Magdalena Imhoff, w/o Conrad Miller and Catharina Imhoff, w/o William Roads. Magdalena and Catharina were sisters of Elizabeth Imhoff Knauer. Christopher was buying out their portion of their father's estate.
There is more information on the Knauers in The Ancestors and Descendants of Jacob Knauer, From Germany to America 1643-1994 which is online from LDS in Salt Lake City.
If you have found more information on Imhoff and would share that would be great.