The Visualogic setup is per pair at that price.
The lack of visibility with the flip-down is a great reason to go with the headrests.
A small added bonus is that 03-04 owners lost articulated headrests from the factory. With the Visualogic monitors, you get that back! I just put a set in and received that little surprise bonus.
I put in an in-dash DVD/TV tuner at the front of the console, the two Visualogic monitors and a SOundgate adapter to use it via the stock head unit.
Went in surprisingly well, other than finding a good source for power. The single longest part was gutting the console to the right depth to fit the player in as I wanted. In all, I probably invested 3 hours of installation.