Some of your choices I agree with, and some I don't (everyone who responds will probably say the same thing).
You have to understand that a new airplane in any sim should meet two requirements:
It should be a useful addition to the arena and/or scenario design.
It should be historically significant.
Thus, on your list above, the Hurricane and Betty stand out, while Mavis and Short Sunderland maybe do not.
Not to denigrate the Mavis or Short but really, how often would we use these airplanes in the course of normal game play?
Not really disagreeing with you, just pointing out some considerations.
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Vadr
Kommandeur, III/JG 2 'Richthofen'
S3 Parser
Combat Flightsim Business Forum
"Well? Ya gonna pull them pistols or whistle Dixie?"