'Kanza' would be one that you should definitely plant; high quality nut, good scab resistance, good production,early ripening.
'Major', the female parent of Kanza, is still a top-producer here in my area, over 100 years after it was selected and first propagated. Not sure how it will do for you, but probably worth trying.
Major & Kanza complement one another very well, with regard to pollen-shed/nutlet receptivity patterns.
Mullahy and Peruque also worth considering for your area - Peruque is a short-season nut - earliest ripening variety growing here(early Sept), with very thin shell and excellent kernel quality - but it's one of the smallest nuts I grow. Mullahy has not produced for me yet, but I consistently see it getting good reviews from folks in IN, IL, OH, etc, and generally ranks well in Nebraska NGA nut evaluations.
I'd certainly be wary of pecans on Southern pecan rootstock, like Elliott...while your grafted northern pecan variety may be adequately cold-hardy, Southern source/variety understock may not be...
I'll second the recommendation of Bill Reid's Northern Pecan Blogspot - lots of really good information there!
NRNTN is my 'go-to', but they have a hard time keeping up with demand. Forrest Keeling Nursery offers some grafted northern pecans, grown in their RPM system. Not sure if you can get small numbers from them or not...