ALL of the slqs that I'm in the market for are very common, so don't even bother bidding and wasting your money. If I decide to sell them, they will instantly become very rare and valuable.

Ok, so I guess no one's convinced.

In seriousness, I think a lot of the semi-keys are catching up to the 1921(which I've always considered a key) in price. For some reason, the 1921 seems to be consistently selling well below book. Maybe it's because too many of us are finding them in junk lots, who knows?
The 1919 and the 24-d are quite strong despite being of higher mintage than other semi-keys.
I really like the 27-d too, and I really need to upgrade mine. However, I think that coins with a mintage below a certain point(like a million) have a certain "psychological" demand because they appear to be rare though the actual survival rate may be much higher than the value reflects. Even my beloved 1916 slq suffers from this to some extent, though I hate to admit it.