Mind you that I only did quick page counts so these aren't exact but will give an idea of ranking.
From the Registry.
A total of 1275 listed boats.
240 22s
279 16s
328 18s - 1/4th of the total.
These three make up 66% of the entire registy list.
The other 34% is spread across all other Donzi models.
The 16 was the first trial balloon, the 18 was always planned as the bread and butter money maker and became the archetypical Deep Vee, Stern Drive, go-fast that other makers reacted to by making competing designs.
The 28 Sportsman was significant, but only as a race boat and starting point for the later Magnum 27 which wouldn't show up for another four years. The production model of the Sportsman wasn't a commercial success.
The Z25 was also an important boat as a new direction for Donzi and probably had the biggest influence to current Donzis. But by then Donzi was simply reacting to a market that had out paced it - and mainly from other Aronow founded companies.
I don't think any of the other donzis, no matter how nice, were particulary innovative or even influential. Maybe the Blackhawk, but that was very short lived.
The 22 classic and close relatives, is an extremely specialized, niche market group of boats. Aside from former 18 owners looking for their next step up in performance where is there even a market for it?