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I understand they've already got an old and extremely credible looking large achromat in one of the two domes, so that's already covered. Re-reading the original post it seems that there is also nothing wrong with the 16" at the moment, other than it does not cut it in the Sydney light pollution. Although the original poster has probably long lost interest as this thread roared off at a tangent, it seems that what they need is better expectation management, and perhaps a good light pollution filter.
I doubt that increasing aperture by a few inches will produce the step-change in the visual experience of a casual visitor they are looking for.
I sometimes wonder if having the corridors and museum at the Perth Observatory lined with large and colourful astrophotos is setting up the visitors for dissapointment. Certainly these days, someone used to seeing the kind of images common in the media is underwhelmed by their first look through a telescope. Unless it's of Saturn.
cheers,
Andrew.
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