Though you declare not being fan of the Speedy, I feel that at least one example should reside in your collection and filling the Triology gap...
... would be a fantastic excuse!
All the examples you show can make happy a demanding collector. I would go for any of those you are considering... before they are gone forever or their prices put definitively in the missing train category!
As this crazy market suggest the Speedy prices trend is to keep rising their values.
I wish to see your own Speedy soon dear Nicolas! Your collection deserves it!
Un abrazo desde las Pampas! Abel