IIRC, the Missilen and Raketen were early Speed 14 discs, and had the honeycombs to reduce drag. The experiment didn't seem to be very successful. I found a Missilen on the course and threw it a few times, but it was too much disc for my arm. Never tried the Rakaten.
The Bolt was a relatively US high speed disc. Decent disc, but still a candidate for OOP land. As to the havoc, yes some of its popularity was with those of us who think the Renegade is not too understable.
The River, when fresh, is in the category of the Leopard/Leopard3/FD/TL molds. The River has great glide and is popular with us casual ams.
The Falchion flies a LOT like Champion Sidewinders, so your assessment of it is pretty accurate vis-a-vis the Valk. I really like the Falchion, and occasionally sneak it into my bag for a round or two.
I haven't tried the Knight.
Time will tell on what gets taken OOP. The Westside Crown and DD Marshal are very similar, so one or the other may go OOP...