Hello Mary and Ethel,
Haven't done much on the Deunk/Duenk issue in my family but as you allready found out: my Johanna Deunk isn't related (for now) to the Duenk family. I have a copy of her marriagerecord and she is named Deunk, her parents being Hindrik Jan Deunk and Johanna Christina Snoeijenbosch. It is a funny coïncidence that a lot people with more or less the same names married to people with also more or less the same names. It shows why you should be very very carefull in copying names from records and only take the names from vital records as official.
This week I came acros a "parenteel" from the Duenk family on the internet. It is just a textfile and maybe the both of you have seen it allready but just in case:http://www.gensdata.nl/search/text/parduenk.txt
I have found this txt on the gensdata site. This site maybe of particular interest to you because it has a searchable database with a lot of records from the so called "DTB" (=death/marriage/burial) books from Aalten before 1811. (http://www.gensdata.nl/sisis/
Because of copyrights these records can only be found through selecting Gelderland as a source in the field "Search in" and typing your criteria in "word in text". You get a list with almost nothing in it but you get more details when you click on "details", you have to select each detail to find the record you're lookin for but it's worth a try.
Ethel, have you seen the Robert Swierenga books on people who left Holland in the 19th century? There is a copy of that book who lists "everybody" who emigrated in 'my archive' but I'm sure there will be copys of this book in Archives in USA and Canada. For further info search his name on Google for instance.