I can tell you that these prices can very well be beaten if you're just looking for some display to play and learn with, you'd have to wait a bit longer for cheaper displays to arrive (from China or so).
Items 2 and 3 are similar, one is 4 lines of 16 characters, the other is 4 lines of 20 characters....The 16 chars display can be equipped with 2 different chipsets, of which 1 is also used in the 20 chars version.I can't tell you about the availability of a library for the SPLC780D or ST7066U, couldn't find data on that fast enough.
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