This test is for Y-DNA (male line) only. So, yes, a male Kehoe relation would be the one for the test. The Y-DNA test shows the male line of father to father to father on your Kehoe line. I don't know what specials they have running at the moment, but by joining the FTDNA Kehoe Project you get an automatic discount.
Aileen, I have been posting mtDNA results on the project site as well, but this would be your mother's mother's mother's line. Still, if you join you will get a discount.