Deb Check out the Posen project. It's people indexing the marriages that appear in the church records. It's currently incomplete but may give you clues as to where they may have came from. My Sahr's came from the Czarnikau district. Many entries come from nearby Birnbaum, Zirke. Some in Gnesen. Schoppe in West Prussia is listed for some odd reason. Some of the entries for Sahr come from the same parish or are microfilmed together for some years.
The Surname Stubbe as the one lady asked about (elorioftheeyes) appears in Lukatz along with the Sahr's from the Czarnikau district.
Deb check out this site too, The Polish Archives is currently uploading records, Church records Civil registers for Posen and some surrounding area's all for free. They update the site every 2-3 months or so with new scans sometimes sooner. Lutheran records represent the German population and the RC ones likely are the native Polish population. Most Germans immigrated to Posen after 1772 so when the register cuts off you will have to look somewhere else in Posen or the German Empire. If you're unable to find a marriage or anything you may want to check the military records. They were filmed from the Berlin archive and will most likely not be uploaded. They are military church records while in the service. Military service was mandatory for all suitable males and births marriages and deaths were recorded. http://www.basia.famula.pl/en/skanyhttp://szukajwarchiwach.pl/
Always check the polish archives listings because they may not have possession of the full records. Some were moved during the wars and LDS may have the whole parish filmed while the archives in Poland only have some years and some were not filmed by LDS at all.
Check these 2 sites for what the polish archives have.http://baza.archiwa.gov.pl/sezam/pradziad.php