Just like the '98 12-valve was the last of a great one, so will the 5. 9 be at the end of this year. I think "Oh-Seven five point nine" will become the next "Ninety-Eight Twelve Valve" buzz phrase among the Dodge Cummins crowd.
Speaking of rarities, you could add '99 and '00 6-speed trucks to the list, along with '98 (and especially '99) Club Cab Rams (in the 6-1/2 years I've been part of this group I've seen only ONE solitary '99 Club Cab!). And one last thing, there were a few 2nd Gen 12-valves that didn't come from the factory with a catalytic converter. . . all those built before 1/1/94. All the rest, until the 24v came out, came with kittys.
Vaughn