Mr. B,
If by NW Cutlery you mean Northwestern Cutlery, simply ask them to do the knives on whetstone only. Though the two grinding wheels they use hardly, at least in my mind, equates to the metal reducing fully automatic sharpeners used by commercial sharpeners.
If still not comfortable with Northwestern Cutlery, another option is to send the knives to
Korin in New York which offers a hand sharpening service. I've not had knives sharpened, but have purchased knives from Korin and been pleased at all my interactions with them.
Enjoy,
Gary
Korin Japanese Trading
http://www.korin.com/
Northwestern Cutlery
810 W Lake St
Chicago
312-421-3666