Turbo Master gets my vote. And they could recolour the mould into Masterpiece Bruticus.
Reflector is the most ridiculously neglected Decepticon of the 1985/86 toy lineup. The guy's in the fricking first episode of the G1 cartoon and he hasn't been reissued in twenty-seven years.
And Action Master Thundercracker would be a better use of the Starscream mould than every single other piece of crap recolour they've ever done with it.