Thanks for the input, guys.
I have been A/B-ing them all morning, after giving them a good rub down with lemon oil. Both cleaned up beautifully, however, the Sansuis are very, very clean; KLHs have a few scuffs and a water ring from what looks to be a cold Budweiser bottle after an intense investigation. The KLHs imperfections were toned down considerably with the lemon oil treatment.
Early, first impressions: Sansuis sound a bit "bright" (hope I am using that term correctly), and the KLHs sound more natural. I am definitely leaning towards the KLHs.
I arranged them into the current TV/audio setup...maybe if I am lucky, the old lady will not notice the addition of 2 pairs of speakers to the setup! The current Wharfedale W40Ds might be on the chopping block as well after hearing these KLH 23s.
edit: forgot to add that the same estate sale had a Bose Cinemate system priced @ 180 which was getting far more attention from what I picked up. I think someone was actually getting ready to buy them as I was shelling out my 45 for 2 pairs of bliss! I overheard one couple ask the estate head salesman if they worked properly, he replied that they did and that his son was a DJ- and knows a bit about speakers and music. I tried to warn the couple- I think they thought that I was trying to talk them out of them so that I could buy them!