Thanks all for the suggestions. I know "Europe Select" is not much to get excited about, but it is only an hour flight. KLM (either direction) gives us a few more options for arrival/departure cities (MUC, NUE, DUS, etc).
I actually have a whole bunch of the Delft houses from back in the early 90's when I did fly KLM "Executive Class" a number of times. Do they still give those out? I figured they'd be victim of the new liquid policies. Makes an argument for KLM on the way home, at least.
I think I have my answer -- KLM WBC seems not be an order of magnitude better or worse then NW WBC. So I'll let the schedule decide (and SWMBO if she wants some more Delft houses
)